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7th Grade Vocab

wavelength The distance between two corresponding parts of a wave.
seismic wave A wave produced by an earthquake.
water wave A wave on the surface of a body of water.
sound wave A disturbance that travels through a medium as a longitudinal wave.
energy The ability to do work.
vibration A repeated back-and-forth or up-and -down motion.
matter Anything that has mass and occupies space.
waves A disturbance that transfers energy from place to place.
energy transfer The process of changing one form of energy into another.
nuclear reactions A reaction involving the particles in the nucleus of an atom that can change one element into another.
atom The smallest part of an element that has all the properties of an element.
chemical change A change in which one or more substances combine or break apart to form new substances.
chemical property A characteristic of a pure substance that describes its ability to change into a different substance.
chemical reaction The process in which substances undergo chemical changes that result in the formation of new substances.
closed system A system in which no matter is allowed to enter or leave.
molecule A neutral particle made of two or more atoms joined by covalent bonds.
products A substance formed as a result of a chemical reaction.
density The amount of mass of a substance in a given volume.
boiling point The temperature at which a liquid boils and turns to vapor.
conductivity The degree to which a material conducts heat or electricity.
pH scale A range of values from 0-14 that expresses the concentration of hydrogen ions in solution.
elements A substance that can not be broken down into any other substance.
periodic table of the elements A system used worldwide for organizing elements into categories.
physical change A change that alters the form or appearance of a material but not its identity.
compound A substance composed of two or more elements chemically combined in a specific ratio.
cell The building blocks of life.
cell cycle The regular sequence of growth and division that cells undergo.
specialized cell In many-celled organisms cells are different from each other.
tissues A group of similar cells that work together to perform a specific function.
organs A group of different tissues that function together.
organ systems A group of organs that work together to perform a major function.
photosynthesis The process by which plants and some other organisms capture the energy in sunlight and use it to make food.
sexual reproduction A biological process that creates a new organism by combining the genetic material of two parent organisms.
asexual reproduction A mode of reproduction in which offspring arise from a single organism with the exact same genes.
unicellular organism Also known as a single-celled organism, a this organism consists of only one cell.
multicellular organism Organisms that consist of more than one cell.
carbon dioxide An important greenhouse gas and burning of carbon-based fuels since the industrial revolution has rapidly increased its concentration in the atmosphere, leading to global warming.
carbohydrate An energy-rich organic compound, such as sugar or starch, that is made up of the elements carbon, hydrogen, and oxygen.
protien Large organic molecules made up of smaller molecules called amino acids.
lipids Energy rich organic molecules such as fats, oils, and waxes.
water cycle The movement of water between the atmosphere and Earth's surface.
atmosphere The layer of gases that surround the planet.
evaporation The change in matter from a liquid to a gas.
water vapor Water in the form of a gas.
condensation The change in matter from a gas to a liquid.
clouds When water vapor in the air condenses around dust particles to form liquid water or ice crystals.
convection The transfer of heat by the movement of a fluid.
ocean currents Streams of water in the ocean that move in regular patterns.
wind The horizontal movement of air from an area of high pressure to an area of low pressure.
weather The conditions of Earth's atmosphere at a particular time and place.
climate The average, year-after-year conditions of temperature, precipitation, winds, and clouds in an area.
frontal boundaries The places where air masses meet and do not mix easily.
cold front A fast-moving cold air mass overtakes a warm air mass.
warm front A warm air mass overtakes a slow-moving cold air mass.
stationary front Cold and warm air masses meet, but neither can move the other.
occluded front A warm air mass is caught between two cooler air masses.
air mass A huge body of air that has similar temperature, humidity, and pressure.
jet stream Bands of high-speed winds about 10 km above Earth's surface.
transpiration Evaporation of water from plants.
precipitation Any form of water that falls from clouds and reaches Earth's surface.
infiltraction The process by which water on the ground surface enters the soil.
surface runoff Runoff is precipitation that did not get (infiltrated) absorbed into the soil, or did not evaporate, and therefore made its way from the ground surface into places that water collect.
groundwater The water located beneath Earth's surface in soil pore spaces and in the fractures of rock formations.
absorption When plants take in water through their roots.
watershed A ridge of high land dividing two areas that are drained by different river systems.
elevation The height above a given level, especially sea level.
surface mining A broad category of mining in which soil and rock overlying the mineral deposit (the overburden) are removed.
deforestation Deforestation is the clearing of trees, transforming a forest into cleared land.
overpopulation This means that there are too many organisms of a certain species in a certain habitat.
dams A large wall or barrier that obstructs or stops the flow of water, forming a reservoir or a lake.
landfill A landfill is a place where waste is kept.
air pressure The result of the weight of a column of air pushing down on an area.
barometer An instrument that is used to measure air pressure.
acid rain Rain that has more acid than normal.
fog A cloud that forms near the ground.
dew point The temperature at which condensation begins.
radiation The direct transfer of energy by electromagnetic waves.
conduction The direct transfer of heat from one substance to another substance that it is touching.
energy Something that can do work. It cannot be created or destroyed.
pollution Harmful substances in the air, water, or soil.
reactant A substance that takes part in and undergoes change during a reaction.
Created by: sikkwl


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