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Vocabulary terms for the ES Regents exam 2025

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Term
Definition
Abrasion   The act of rock particles scraping or wearing away against other rock.  
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Absolute Dating   Using radioactive decay to determine the exact age of a rock, fossil, or event.  
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Agents of Erosion   Forces that are set in motion by gravity that causes sediments to move.  
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Air Currents   The rising or sinking movement of air perpendicular to the ground.  
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Air Mass   Characteristics of the air identified by temperature and moisture.  
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Air Pressure   The force exerted on a unit of area by the air that is exerted equally in every direction.  
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Altitude   The angular distance measured above the horizon in degrees.  
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Anemometer   An instrument used to measure the speed of the wind.  
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Asthenosphere   A partially melted layer that allows for parts of the lithosphere to move.  
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Asteroid Belt   A region between Mars and Jupiter where most of the asteroids are found orbiting the Sun.  
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Astronomy   The study of Earth’s motions and celestial objects in outer space.  
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Atmosphere   Layer of gases that surround Earth or any other planet.  
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Azimuth   Angular distance along the horizon measured from due north.  
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Banding   Type of foliation where pressure separates minerals into alternating light and dark layers.  
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Barometer   An instrument used to measure atmospheric pressure.  
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Big Bang   Leading theory of the origin of the Universe as observed from the expanding Universe.  
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Bioclastic   Sedimentary rock type that forms from the remains of plants and animals.  
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Celestial Object   Natural objects that can be seen in the sky that is above Earth’s atmosphere.  
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Cementation   The act or process of holding sediment or pieces of rock together.  
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Chemical Weathering   The breakdown of rock through a change in mineral or chemical composition.  
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Circle   A perfect geometric figure with one center point.  
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Clastic   Sedimentary rock type that forms from the fragments or pieces of other rocks.  
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Cleavage   The tendency of a mineral to break along zones of weakness and form flat or parallel surfaces.  
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Climate   Overall view of a regions weather conditions over a long time span.  
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Climatology   The study of Earth’s weather variables and patterns over long periods of time.  
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Clinometer   An instrument that is used to measure an incline.  
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Cold Front   A boundary where more dense cold air advances under less dense warm air pushing it up.  
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Colloid   A small particle that remains suspended indefinitely.  
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Compaction   The consolidation of sediments resulting from the weight of overlying deposits.  
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Condensation   The process which atmospheric water vapor turns into precipitation [gas to a liquid].  
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Contact Metamorphism   Localized metamorphism resulting from the heat of an igneous intrusion.  
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Continental Drift   The theory that Earth’s continents are moving.  
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Continental Glacier   Huge sheets of ice that cover entire land masses  
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Contour Index   Lines that are bolder and have an elevation labeled.  
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Contour Interval   The difference in elevation between two side by side contour lines.  
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Contour Line   Lines drawn on a map that connect equal points of elevation.  
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Convection   Driving force of plate movement.  
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Convergent Boundary   Boundary where two lithospheric plates are coming together.  
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Coordinate System   A system which uses one or more numbers to locate a position.  
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Coriolis Effect   The tendency of particles to be deflected from a straight line.  
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Correlation   The process of showing that rocks or geologic events from different places are similar in age.  
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Crescent Moon   Figure of the moon resembling a segment of a ring tapering to points at the ends.  
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Crystalline   A naturally occurring solid that is formed as and composed of crystals.  
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Cyclic Change   A repeating pattern that occurs over and over again.  
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Density   The degree of compactness of a substance which is the ratio of mass to its volume.  
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Dependent Variable   The variable that is measured and affected in an experiment.  
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Deposition   The process by which sediments are released from erosion.  
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Depression Contours   Contour lines marked with hachured lines that signify a depression.  
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Dewpoint   The temperature at which air must be cooled for water vapor to condense.  
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Direct Relationship   When the x-axis and y-axis increase.  
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Divergent Boundary   Boundary where two lithospheric plates are moving apart.  
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Drumlin   A low oval mound consisting of glacial till.  
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Earthquake   A natural shaking of the lithosphere caused by a release of energy stored in rocks.  
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Eccentricity   The degree of flatness or “ovalness” of an ellipse.  
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Ecology   The study of how living things interact with their environments.  
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Electromagnetic Energy   Energy that is radiated through space in the forms of transverse waves.  
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Element   A substances that cannot be separated into simpler substances by chemical means.  
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Elevation   The vertical distance or height above or below sea level.  
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Ellipse   Special geometric shape with two center points and is the oval shape of a planet’s orbits.  
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Eon   A longest division of geologic time that is further subdivided.  
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Epicenter   Location on the surface directly above the focus.  
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Epoch   A division of time that is a subdivision of a period that is based on fossil records.  
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Equator   The horizontal main reference line of latitude [0°].  
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Era   A major division of time that is a subdivision of an eon and is based on fossil records.  
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Erosion   Process where rock fragments are transported.  
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Erratics   Transported rock fragments that are carried on top or within a from glacier and deposited.  
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Esker   A long winding ridge of gravel and sediment deposited by meltwater from a retreating glacier.  
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Evolution   The gradual development from a simple to a more complex form.  
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Extinction   The state or process of a species no longer existing.  
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Extrapolate   To infer or estimate by projecting known information.  
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Extrusive   A type of igneous rock that forms on the outside of Earth’s surface.  
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Fault   A break in rock layers that is marked by the relative displacement on either side.  
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Felsic   Light colored rocks that have a high aluminum [Al] content.  
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Field   A region with a measurable quantity at all locations.  
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Focal Depth   The depth at which an earthquake originates.  
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Foci   The two fixed center points of an ellipse.  
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Focus   The point inside the Earth where the earthquake originates.  
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Foliation   Type of texture when minerals rearrange in flat layers due to pressure.  
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Fossil   A remnant or trace of an organism of a past geologic age.  
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Fracture   A texture that causes minerals to break irregularly or unevenly.  
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Frost Action   Weathering process caused by cycles of freezing and thawing of water in rock openings.  
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Full Moon   The phase of the moon in which its whole disk is illuminated.  
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Galaxy   A collection of billions of stars and various amounts of gas held together by gravity.  
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Geocentric Universe   The idea that Earth was at the center of the solar system.  
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Geology   The study of the rocky portion of Earth.  
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Geographic Poles   Two points on the surface of a rotating planet where the axis of rotation meets the surface.  
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Glacial Grooves   Parallel scratches from sediment embedded under glaciers.  
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Glacier   A naturally formed mass of ice and snow that moves downhill under the force of gravity.  
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Gibbous Moon   Any moon that appears more than half lighted but less than full.  
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Glossopteris   A tree fossil that is found in South American and Africa, India and Antarctica.  
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Gradient   A slope that is calculated by dividing the change in field value divided by the distance.  
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Greenhouse Effect   The trapping of the sun's heat energy in a planet's lower atmosphere.  
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Half-life   The time required for half of a radioactive product to decay to a stable product.  
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Hardness   The resistance to a mineral being scratched to other minerals or object.  
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Heliocentric Model   A model of the solar system where the Sun is at the center.  
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High Pressure   Fair weather with wind patterns that are outward and clockwise.  
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Horizon   The edge of the visible portion of the celestial sphere.  
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Horizontal Sorting   Sorting from a decrease in stream velocity where particles are deposited from largest to smallest.  
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H-R Diagram   A chart used to classify stars according to their luminosity, mass, color and temperature.  
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Hurricane   A low pressure tropical storm that reaches winds above 74 mph.  
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Hydrology   The study of Earth’s fresh water system in relation to land.  
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Hydrosphere   A layer of Earth above the lithosphere that is in the liquid phase.  
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Igneous Rock   Rock type that forms when molten material solidifies.  
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Independent Variable   The variable that stands alone and isn’t changed by other factors.  
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Index Fossil   Fossil used to define and identify geologic periods.  
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Infiltration   The process which water penetrates into soil or rock.  
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Inner Core   The solid inner most zone of Earth’s core composed of iron [Fe] and nickel [Ni].  
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Insolation   Term to describe incoming solar radiation from the Sun [sunlight].  
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Intrusion   Magma cools and solidifies before it reaches Earth’s surface.  
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Intrusive   Igneous rock that forms deep inside of Earth.  
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Inverse Relationship   When the x-axis increases and y-axis decreases  
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Island Arc   A curved belt of volcanic islands lying above a subduction zone.  
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Isobar   Lines that are drawn on a map that connect all equal points of air pressure.  
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Isoline   Lines that are drawn on a map that connect all equal points of data.  
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Isotherm   Lines that are drawn on a map that connect all equal points of temperature.  
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Isotope   Variations of an element that have the same atomic number but differing atomic masses.  
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Isohyet   Lines that are drawn on a map that connect all equal points of rainfall amounts.  
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Jovian Planet   The outer gaseous planet with larger diameters and lower densities.  
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Kettle Lake   Depression left in the ground that is filled with glacial melt water.  
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Landscape   A collection of landforms, such as mountains, hills, plains, and plateaus  
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Latitude   Measuring lines, north or south, from the equator.  
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Lava   Molten rock that is outside the Earth.  
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Leeward   On or toward the side sheltered from the wind or toward which the wind is blowing.  
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Lightyear   A unit of astronomical distance equivalent to the distance that light travels in one year.  
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Lithification   The processes and methods in which sedimentary rocks form.  
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Lithosphere   Layer of Earth that is the rigid outer part of the earth, consisting of the crust and upper mantle.  
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Long Shore Current   Ocean current that flows parallel and close to the shore.  
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Lowlands   Landscape that is of lower elevation.  
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Low Pressure   Stormy weather with wind patterns that are inward and counterclockwise.  
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Luminosity   A measure on how bright a star is compared to our Sun.  
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Luster   The shine of an unweathered mineral or the way it looks in reflected light.  
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Mafic   Dark colored rocks that have a high iron [Fe] or magnesium (Mg) content.  
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Magma   Molten rock inside the Earth.  
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Main Sequence   Star classification not the H-R Diagram where most stars spend their stellar lives.  
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Major Axis   The longest straight lined distance across an ellipse.  
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Mantle   The thickest layer of Earth that makes up approximately 80% of Earth’s volume.  
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Map   A representation of an area of land or sea showing physical features.  
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Mass   The amount of matter in an object.  
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Mass Movement   The pulling of rock and sediment downhill by the force of gravity.  
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Meander   As a stream gets older it begins the shift its course in a series of bends.  
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Mesosaurus   A dinosaur fossil found in South American and South Africa.  
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Mercalli Scale   The effect of an earthquake on the Earth's surface based on observations.  
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Metamorphic Rocks   Rocks that have been altered by an increases in temperature and pressure.  
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Meteorology   The study of weather and the atmosphere.  
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Mid-Ocean Ridge   Underwater mountain range created from a divergent plate boundary.  
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Mineral   Naturally occurring, inorganic solid with a definite structure where atoms are in a repeating pattern.  
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MOHO   A thin interface between the lithosphere from the asthenosphere.  
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Moon   A body that orbits a planet or asteroid as they orbit the Sun.  
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Mountain   A large natural elevation of the earth's surface.  
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New Moon   The phase of the moon when it is in conjunction with the sun and invisible from earth.  
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Nonfoliated   Type of metamorphic rock texture where there is no mineral alignment.  
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Nuclear Fusion   A reaction in which two atomic nuclei combine to form one atomic nuclei while releasing energy.  
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Oceanography   The branch of science that deals with the physical and biological properties of the ocean.  
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Original Horizontality   The idea that rocks are deposited in parallel layers to Earth’s surface.  
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Orographic Effect   The effect of rising air causing it to expand, cool and condense resulting in precipitation.  
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Outer Core   Liquid layer of Earth’s interior.  
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Outgassing   The outpouring of gases from the earth's interior that collected in the atmosphere.  
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Outwash Plain   Glacial feature of smaller sediment carried from the melting water of a retreating glacier.  
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Oxidation   When iron combines with oxygen to create rust.  
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P-wave   The fastest earthquake wave that travels through the earth [compressional].  
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Pangaea   Name given to the super continent that existed 200 million years ago meaning “all Earth”.  
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Parent Rock   Preexisting rock from which rocks are formed.  
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Physical Weathering   The breakdown of rock into smaller pieces without chemical change.  
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Planet   A celestial body moving in an elliptical orbit around a star.  
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Plains   Landscape that is of lower elevation.  
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Plate   Section of the lithosphere that move due to convection currents.  
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Plate Tectonics   Study of the formation and movements of plates.  
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Plateau   Landscape that is of medium elevation and have a flat top.  
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Plutonic Rock   Igneous rocks that solidify slowly below the surface of Earth.  
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Polar Star   Star directly above the North or South Pole.  
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Prevailing Winds   Wind from the direction that is predominant at a particular place or season.  
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Prime Meridian   The main reference line of longitude [0°] that runs through Greenwich, England.  
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Prong   Landscape that is of lower elevation.  
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Radiative Balance   Balancing out of incoming and outgoing radiation.  
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Radioactive Decay   The disintegration of an isotope over time that enables dating.  
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Rainshadow Effect   Typically the leeward side of a mountain that experience minimal to no rainfall.  
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Rate of Change   The speed at which a variable changes over a specific period of time.  
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Recrystallization   The act of a rock crystallizing again.  
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Regional Metamorphism   Large scale metamorphism resulting from the heat and pressure below Earth’s surface..  
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Relative Dating   The sequencing of rocks or events in relation to the ages of other rocks or events.  
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Relative Humidity   The amount of water vapor in the air at any given time.  
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Revolution   The motion of one body around another in an orbit.  
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Ring of Fire   Isolated belt around the Pacific Ocean where 90% of the world’s volcanoes exist.  
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Rock   A naturally formed solid that is part of Earth or any other celestial object.  
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Rotation   The movement of an object around a line of axis.  
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S-wave   The slower earthquake wave that travels through the earth (shear).  
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Saffir-Simpson Scale   A system for classifying hurricanes based on wind speed.  
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Sea-floor Spreading   The process where ocean floor is extended when two plates move apart.  
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Sedimentary Rock   Rock type from an accumulation of sediment from preexisting rocks and/or organic material.  
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Sediments   Smaller pieces of rock that have undergone weathering.  
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Seismogram   A record of the seismometer.  
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Seismograph   An instrument used to measure and record movements in the ground.  
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Sling Psychrometer   An instrument used to measure dew point and relative humidity.  
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Solar System   All the objects that orbit the Sun under its gravitational influence.  
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Soluble   The ability for a substance to be dissolved, especially in water.  
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Source Region   A location over which an air mass gets its characteristics.  
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Southwesterly Winds   Prevailing winds between 30° N and 60° N.  
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Stable Product   A nonradioactive element after decay.  
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Star   Large ball of gas held together by gravity that produces energy and shines.  
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Station Model   A symbol on a weather map that illustrates all the weather conditions at that location.  
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Storm Surge   A dome of water that moves onto shore near the landfall point of the hurricane.  
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Storm Track   The path that a hurricane takes.  
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Streak   The color of finely crushed powder when a mineral is dragged across a porcelain plate.  
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Stream   Running water that is confined to a channel.  
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Subduction   The process where one plate is pushed below another and consumed in the mantle.  
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Sunspot   A spot appearing on the Sun's surface, usually darker by contrast than its surroundings.  
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Superposition   The idea that the bottom layer is the oldest and each overlying layer gets progressively younger.  
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Suspension   When a particle remains floating.  
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Temperature   The heat energy present in the atmosphere.  
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Terminal Moraine   A mound of till deposited along the leading edge of a glacier  
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Terrestrial Planet   Solid surfaced planet with smaller diameters and higher densities.  
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Thermometer   An instrument used to measure temperature at a specific location.  
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Topographic Map   A model of an elevation field of Earth’s surface.  
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Topographic Profile   A side view of a geologic feature.  
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Tornado   A rotating column of whirling air with destructively high winds.  
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Trade Winds   Prevailing winds between 30° N and 0°.  
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Transform Boundary   Boundary where two lithospheric plates are sliding past one another.  
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Tributary   A smaller stream that feeds a larger stream or lake.  
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Tropical Depression   Low pressure that produces sustained circular winds below 39 mph.  
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Tropical Storm   Low pressure that produces sustained circular winds above 39 mph, but less than hurricane.  
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U-Shaped Valley   The result of glacial erosion on the sides of valley walls.  
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Unconformity   A break in the rock record or sequence that usually occurs from erosion.  
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Uniformitarianism   Idea that forces working on our planet today worked on our planet in the past in the same way.  
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Universe   All the space, matter, and energy in existence.  
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Unstable Product   A radioactive element.  
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V-Shaped Valley   Shape of valley walls from stream erosion.  
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Valley Glacier   Glaciers that form in high elevations in mountain valleys.  
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Vesicular   Texture that consists of gas pockets that give the appearance of having holes.  
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Volcanic Rock   Rock that formed on Earth’s surface.  
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Volcano   A vent in the crust of the earth from which molten material and steam is ejected from  
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Volume   The amount of space that an object occupies.  
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Waning Moon   When the moon decreases in size and becomes less brilliant.  
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Warm Front   A boundary where less dense warm air advances over top of more dense cold air.  
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Waxing Moon   When the moon increases in size and becomes more brilliant.  
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Weather   The present condition of the atmosphere with respect to changing weather variables.  
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Weather Vane   An instrument used to measure wind direction.  
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Weathering   The breakdown of rock at or near Earth’s surface.  
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Weight   The effect of gravity on weight.  
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Wind   The horizontal movement of air parallel to the surface.  
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Windward   The side or direction from which the wind is blowing  
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Zenith   The highest point on the celestial sphere.  
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