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7th grade science terms

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Question
Answer
Continental drift   Wegener's hypothesis that all continents were once connected in a single large landmass that broke apart about 200 million years ago and drifted slowly to their current positions  
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Mantle   Thin layer of tissue that covers a mollusk's body and that can secrete a shell  
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Density   Measurable physical property that can be found by dividing the mass of an object by its volume  
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Asthenosphere   Plasticlike layer of Earth which the lithospheric plates float and move around  
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Oceanic Crust   The thin crust under the oceans is thinner and denser than continental crust  
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Mass   The amount of matter in a given object  
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Volume   The amount of space an object takes up  
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Matter   Anything that has mass and takes up space and is made up of different kinds of atoms; includes all things that can be seen, tasted, smelled, or touched but does not include heat, sound, or lgiht  
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Plate Tectonics   Theory that Earth's crust and upper mantle are broken into plates that float and move around on a plasticlike layer of the mantle  
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Equator   Imaginary line that wraps around Earth at 0 latitude, halfway between the north and south poles  
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Prime Meridian   Imaginary line that represents 0 longitude and runs from the north pole through Greenwich, England, to the north pole  
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Latitude   Distance in degree north or south of the equator  
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Longitude   Distance in degrees east or west of the prime meridian  
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Convection Current   Current in Earth's mantle that transfers heat in Earth's interior and is the driving force of plate tectonics  
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Seafloor Spreading   Hess's theory that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean rigde  
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Scientific methods   problem-solving procedures that can include identifying the problem or question, gathering information, developing a hypothesis, testing the hypothesis,analyzing the results, and drawing conclusion  
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Pangaea   Large, ancient landmass that was composed of all the continets join together  
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Scientific Theory   Explanation that is supported by results from repeated experimentation or testing  
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Earthquake   Movement of the ground that occurs when rocks inside Earth pass their elastic, limit, break suddenly, and experience elastic rebound.  
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