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24 Cards in this Set
- Front
- Back
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equator
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an imaginary line that divides the earth into the Northern and Southern Hemispheres
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oblate spheroid
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a slightly flattened sphere
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axis
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an imaginary straight line running through the earth from the North Pole to the South Pole
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hydrosphere
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all the earth's water
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atmosphere
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blanket of gases surrounding the earth
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seismic waves
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vibrations that travel through the earth
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crust
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thin, solid outermost zone of the earth
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mass
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the amount of matter in an object
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oceanic crust
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crust beneath the oceans
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continental crust
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part of the crust on which the continents rest
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mantle
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a zone of rock nearly 2,870 km thick; makes up almost two-thirds of the earth's mass
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lithosphere
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a rigid layer 65 km to 100 km thick
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asthenosphere
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approximately 200 km thick
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plasticity
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the ability of a solid to flow
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core
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below the mantle; forms the center of the earth and is made mostly of iron
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p waves
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travel through liquids solids and gases
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s waves
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travel only through solids
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Moho
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boundary between the crust and the mantle
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shadow zones
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locations on the earth's surface where neither S waves nor P waves are detected or where only P waves are detected
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magnetosphere
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the region of space beyond the atmosphere
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gravity
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the force of attraction that exists between all matter in the universe
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law of gravitation
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states that the force of attraction between any two objects depends upon their masses and the distance between them
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weight
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the strength of the pull of gravity on an object
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newtons
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unit used to measure weight
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