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25 Cards in this Set
- Front
- Back
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Seismic Wave
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vibration that travels through the earth.
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Autumnal Equinox
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beginning of the fall season.
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Axis
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imaginary straight line running through the earth from pole to pole.
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Crust
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outermost zone of the solid earth.
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Mantle
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zone of rock below the earth's crust.
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Core
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center of a planetary body, such as the earth
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Moho
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the Mohorovic discontinuity, boundary between the earth's crust and mantle.
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Shadow Zones
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location on the earth's surface where no seismic waves or only P waves can be detected.
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Magnetosphere
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a region of space that is affected the earth's magnetic field.
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Gravity
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force of attraction between all matter in the universe.
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Law of Gravitation
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principle that the force of attraction between two objects depends on the masses and the distance between the objects.
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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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hydrosphere
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all the earths water.
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atmosphere
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thick blanket of gasses surrounding 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 oceans.
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continental crust
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the crust on which the continents rest.
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lithosphere
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thin outer shell of the earth consisting of the crust and the rigid upper mantle
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asthenosphere
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zone of mantle beneath the lithosphere that consists of slowly flowing solid rock.
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plasticity
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the ability of a solid to flow.
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P waves
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primary waves
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S waves
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secondary waves
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weight
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a measure of the the strength of the the pull of gravity on an object.
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newtons
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what weight is measured in.
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