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Science Vocabulary Words Third Grade by Serena Georges adaptations A part of animal’s body or way that an animal behaves that helps it survive carnivore An animal that eats other animals chemical change When a screw or nail begins to rust it is a chemical change A change that forms a different kind of matter classify Group items by specific characteristics, color, shape, size, etc. community A population of organisms that live in an ecosystem condensation The changing of a gas into liquid consumer A living thing that eats other living things as food core The center of the Earth crust The Earth’s outermost surface decomposer A living thing that breaks down dead organisms for food desert An ecosystem where there is very little rain Earth The third planet from the Sun earthquake The shaken of the Earth caused by movement of the crust and mantle ecosystem The living and nonliving things in an environment environment The things, living and nonliving, that surround a living thing evaporation The process by which a liquid changes into a gas extinct Describes a species that is gone forever food chain The path of food from one living thing to another food web A model that shows how a food chain overlaps force A push or pull forest An areas in which the main plants are trees fossil Something that lasted from a living thing that died long ago fossil fuels A fuel formed from the remains of once living organisms fresh water Water that has very little salt in it gas A form of matter that does not have a definite shape or a definite volume glaciers A large, slow-moving river of ice, form by compacted layers of snow grassland An ecosystem made up of large, flat areas of land that are covered with grass gravity A force that pulls objects towards each other habitat A place where a population lives in an ecosystem herbivore An animal that eats plants hibernate To enter a deep sleep in which life activities slow down humus The part of the soil made up of the decayed parts of once living things inclined plane A simple machine that has a flat surface set at an angle to another surface inexhaustible resource A natural resource such as air or water that can be used over and over and can’t be used up inner core The central part of the Earth’s core inclined plane A simple machine made of a flat surface set at an angle to another surface inherit To receive traits from parents instinct A behavior an animal knows how to do without being taught landform A natural shape or feature of the Earth’s surface lever A bar that moves on or around a fixed point liquid A form of matter that has volume that stays the same, but can change its shape loam A type of topsoil that is rich in minerals and has lots of humus magnet An object that attracts certain materials, such as iron, steel, nickel or cobalt magnetism The force of repulsion (pushing) or attraction (pulling) between poles of magnets magnetic pole The end of a magnet magnetic field The space all around a magnet where the force of the magnet can act mantle The layer of the Earth between the crust and the core matter Anything that takes up space mass The amount of matter in an object migrate To travel as a group from one place to live in another mimicry An animal’s imitation of another animal or object in order to avoid predators mineral An object that is solid, is formed by nature and has never been alive motion A change in position mountain A landform; a place on Earth’s surface that is much higher than the land around it natural resource Material found in nature and that is used by people nonrenewable resource A resource such as coal or oil that can be used up omnivore An animal that eats both plants an animals observation When you observe an object using your senses or record data about the object using scientific instruments. orbit The path an object takes as it moves around another object in space Earth orbits the Sun. predict To say what will happen using clues to support my guess physical change A change to matter in which no new matter is formed physical property Anything you can observe about an object using your senses plain A landform; a flat area of Earth’s surface planet A large body of rock or gas that orbits the sun plates Part of the Earth’s crust that is broken up into huge areas that drift atop the mantle plateau A landform; a flat area higher than the land around it population A group of the same kind of living thing that all live in one place at the same time precipitation The water that falls to Earth as rain, snow, sleet or hail predator An animal that hunts another animal for food prey An animal that hunted by a predator producer A living thing that makes its own food push A force used to move or change an object’s position pull A force used to move or change an object’s position recycle To reuse a resource to make something new reflection The bouncing of a light off an object refraction The bending of light when it moves from one kind of matter to another renewable resources A resource that can be replaced in a human lifetime revolution The movement of one object around another object reusable resources A resource that can be used over and over and can’t get used up like air and water rotation The spinning of an object on its axis salt water Water that has a lot of salt in it scientific method Steps scientists take to answer a question or solve a problem. simple machines A tool that helps people do work solar system The Sun and the objects that orbit around it solid A form of matter that takes up a specific amount of space and has a definite shape soil A loose material in which plants can grow in the upper layer of the Earth speed The measure of how fast something moves over a certain distance star A hot ball of glowing gases, like our sun temperature A measure of how hot or cold something is thermometer A tool used to measure temperature topsoil The top layer of soil made up of the smallest grains and the most humus trait A body feature that an animal inherits; it can also be some things an animal does tropical rain forest A hot, wet forest where trees grow very tall and their leaves stay green all year valley A landform; a lowland area between higher lands, such as mountains vibrate To move quickly back and forth, producing sound volcano An opening in Earth’s surface from which lava flows volume The amount of space matter takes up water cycle The movement of water from Earth’s surface into the air and back to the surface again weathering The process by which rock is worn and broken down weight The measure of the pull of gravity on an object wind The movement of air work The measure of force that it takes to move an object a certain distance