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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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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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a blanket of gases that surround 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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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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the crust beneath the ocreans
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contenental crust
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the crust that makes up the contenents
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mantle
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a zone of rock that is 2,900 km thick and lies elow the crust
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lithosphere
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the uppermost part of the mantle and the crust. This is a ridgid layer 15-300 km thick
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asthenosphere
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the layer below the lithosphere. This are has enormouse heat and pressure alowing the rock to flow. This are is 200 km thick.
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placticity
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the ability of solid rock to flow.
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P waves
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seismic waves that travel through liquids, gases, and solids.
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S waves
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seismic waves that travel through only through solids.
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moho
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a boundary beneath the earth's surface that lies between the crust and the mantle. The boundary changes the speeds of seismic waves.
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shadow zones
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locations on the earth's surface were neither S waves nor P waves are detected or where only P waves are detected. They occur because the material in earth's interior are not uniform in rigidity.
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magnetosphere
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the region of space which is affected by earth's magnetic field
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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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the force of attraction between any two objects depends on their masses and the distance between them.
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weight
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a measure of the strength of the pull of gravity on an object
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newtons
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used to measure weight
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core
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located below the mantle and forms the center of the earth. It is mostly iron and made up of a liquid outer core and a solid inner core.
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