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22 Cards in this Set
- Front
- Back
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equator
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imaginary line that divides the earth into northern and souther 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 to the north and south pole causes the poles to flatten and the equator zone to bulge.
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hydrosphere
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all the earths water
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atmosphere
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a blanket of gases surrounding the earth.
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seismic waves
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a vibration that travels through the earth
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crust
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solid outer most zone on the earth
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mass
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the amount of matter in an object
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oceanic crust
continental crust |
the crust beneath the ocean
the crust that makes up the contients |
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mantle
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a zone of rock 2900 km thick
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lithosphere
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uppermost part of the mantle it is cool and brittle. 15 km to 300 km thick
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asthosphere
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the solid layer under the lithosphere in the mantle under a lot of heat and pressure making it plasticity. 200 km thick
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plasticity
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the ability for solid objects to flow
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core
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forms the center of the earth under the mantle. mostly made of iron
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p waves
s waves |
primary waves travel through solid/liquid/gases. faster than s waves
secondary waves travel through solids Both are effected by the composition of what they are traveling through |
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Mohorovicic discontinuity (moho)
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change in the speed of the waves mark the boundary between the crust and the mantel.
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shadow zone
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locations on the earths surface where neither P/S waves are detected or where only P waves are detected
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magnetosphere
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the region in space that extends beyond the atmosphere which is effected by the earths 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 gravity
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states that the force of attraction between any two objects depends upon their mass and distance between them
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weight
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is a measure of the strength of the pull of gravity on an object
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newtons
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the measurement of weight
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