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100 Definitions

100 Definitions for 6th Grade Science

Adaptation A change or the process of change in which an organism becomes better suited to its environment.
Analyze To examine carefully and in detail to identify causes, key factors, or results.
Atmosphere The envelope of gases that surrounds Earth.
Carbon Cycle A series of processes in which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.
Cell The basic structural unit of all organisms.
Cell Membrane The part of the cell that protects its interior from the outside environment.
Cell Wall The part of the cell that provides it structural support and protection. It also acts as a filtering mechanism.
Cementation The process in which dissolved minerals crystallize and glue particles of sediment together into one mass. It is the fourth step to form a sedimentary rock.
Centi One hundredth of a basic unit of measurement.
Chloroplast Only found in plant cells, it's the organelle where photosynthesis takes place.
Circulatory System The body system that is made up of blood vessels that carry blood away from and towards the heart.
Classify To organize into groups based on similarities.
Climate The weather conditions in an area of long periods of time.
Compaction The process in which minerals are pressed together under their own weight. It is the third step to form a sedimentary rock.
Compare To examine two or more objects and note similarities.
Conclusion The outcome of an experiment to tell if your hypothesis is correct or incorrect.
Conduction The direct transfer of thermal energy by two objects that are touching.
Conservation The practice of using less of a resource so that it will not be used up.
Continental Drift The hypothesis that the continents slowly move across Earth's lithosphere.
Contrast To examine two or more objects and note unlikeness or differences.
Controlled Experiment An experiment in which only one variable is manipulated at a time.
Controlled Variable The variables that are not changed in an experiment.
Convection The transfer of thermal energy by the movement of a liquid or a gas.
Convergent Boundary A plate boundary where two plates move toward each other. It is the main cause for mountains to form.
Core The central region of an object.
Crust The layer of rock that forms Earth's outer surface.
Data Facts, figures, and other evidence gather through observation.
Density The amount of mass of an object in a given volume.
Deposition The process in which sediment is paid down in new locations. It is the second step to form a sedimentary rock.
Digestive System The parts of the body that work together to turn food and liquids into the building blocks and fuel the body needs.
Divergent Boundary A plate boundary where two plates move away from each other. It is the main cause for volcanoes and rift valleys to form.
Dormant A volcano that is not currently active, but that may become active in the future.
Earthquake The shaking that results from the movement of rock beneath Earth's surface.
Electromagnetic Radiation Energy that travels through space in the form of waves.
Energy The ability to do work or cause change.
Erosion The destructive process in which water, wind, or gravity loosens and carries away fragments of rock. It is the first step to form a sedimentary rock.
Estimate An approximate judement or evaluation.
Evaluate To determine the significance or worth of the results of an experiment.
Evolution The process by which all of the different kinds of living things have changed over time.
Excretory System The system in the body that is in charge of getting rid of wastes and extra water.
Extinct A volcano that is no longer active and is unlikely to erupt again. Or an organism that no longer lives on Earth.
Fault A break or crack in Earth's lithosphere along which the rocks move.
Fossil A trace of an ancient organism that has been preserved in rock.
Fossil Fuel An energy rich substance (such as coal, oil, or natural gas) formed from the remains of organisms.
Geologic Time Scale A record of the geologic events and life forms in Earth's history.
Geologist A scientist that studies the forces that make and shape planet Earth.
Gram The basic metric unit to measure mass.
Graph An instrument for making records.
Habitat The place where an organism lives and where it obtains all the things it needs to survive.
Hypothesis A possible explanation for a set of observations or an answer to a scientific questions. It must be testable! It's also called an educated guess.
Igneous Rock A type of rock that forms from the cooling of molten rock at or below the surface.
Infer/Inference To draw a conclusion based on reasoning.
Interpret To give or provide the meaning of.
Kilo One thousand of a basic unit of measurement.
Kinetic Energy The energy an object has due to its motion.
Lava Liquid magma that reaches the surface.
Liter The basic metric unit of volume.
Magma The molten mixture of rock-forming substances, gases, and water from the mantle.
Manipulated/Independent Variable The one factor that a scientist changes during an experiment.
Mantle The layer of hot, solid material between Earth's crust and core.
Mass The amount of matter in a object.
Matter Anything that has mass and takes up space.
Metamorphic Rock A type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions.
Meteorologist A scientist who studies the causes of weather and tries to predict it.
Meter The basic metric unit to measure length.
Metric System A decimal system of weights and measures based on the meter as a unit of length, the gram as a unit of mass, and the liter as a unit of volume.
Milli One thousandth of a basic unit of measurement.
Mineral A naturally occurring, inorganic solid that has a crystal structure and a definite chemical composition. They make up most rocks.
Mitochondria An organelle that keeps the cell full of energy. It is the cell's powerhouse.
Muscular System The system in the body that the main function is to produce movement.
Nervous System The body system that is the highway in which the brain sends and receives information about what is happening in the body around it.
Nucleus The organelle of a cell that is the main control center and acts kind of like the cell's brain.
Observing The process of using one or more of your senses to gather information.
Organ A group of tissues in a living organism that has a specific form and function.
Organelle A part of a cell that has a specific function.
Pangaea The name of the single landmass that broke apart over 200 million years ago and gave rise to today's continents.
Potential Energy Energy that is stored and available to be used later.
Predicting To tell in advance what you think is going to happen.
Purpose An intended or desired result. It is what you want to learn in an experiment.
Qualitative Pertaining to quality or qualities.
Quantitative Pertaining to the measurement of quantitiy.
Respiratory System The body system that handles breathing. It brings oxygen into the body and gets rid of carbon dioxide.
Responding/Dependant Variable The factor that changes as a result of changes to the manipulated variable.
Rock Cycle A series of processes on the surface and inside Earth that slowly changes rocks from one kind to another.
Science A way of learning about the natural world.
Scientific Law A statement that describes what scientists expect to happen every time under a particular set of conditions.
Scientific Method The ongoing process of discovery in science.
Scientific Theory A well-tested concept that explains a wide range of observations.
Sedimentary Rock A type of rock that forms when particles of other rocks or the remains of plants and animals are pressed and cemented together.
Seismic Waves Waves of energy in the Earth produced by earthquakes or other means.
Summarize To put an answer into a brief and comprehensible format.
Tissue Groups of cells that have a similar structure and act together to perform a specific function.
Transform Boundary A plate boundary where two plates move past each other in opposite directions. It is the main cause of earthquakes.
Variable A factor that can change in an experiment.
Volcano A weak spot in the crust where magma has come to the surface.
Volume The amount of space on object takes up.
Water Cycle The continual movement of water among Earth's atmosphere, oceans, and land surface through evaporation, condensation, and precipitation.
Weather The condition of Earth's atmosphere at a particular time and place.
X-axis The horizontal axis of a coordinate system.
Y-axis The vertical axis of a coordinate system.
Created by: mjaecks
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