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24 Cards in this Set
- Front
- Back
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Seismic Waves
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They are vibrations that travel through the earth.
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Crust
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The thin, solid outermost zone of the earth is the outer covering.
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Mantle
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A zone of rock nearly 2,870 thick. the top part is solid.
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Core
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It forms the center of the earth and is made mostly of iron.
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Moho
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This change in the speed of the waves marks the boundary between the crust and the mantle.
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Shadow zones
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Shadow zones are 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, which is affected by the earth's magentic 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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This law states that the force of attraction between any two objects depends upon their masses of two objects and the closer together they are.
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Equator
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The imaginary line that divides the earth into the northern and southern hemisphere.
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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 earth's water.
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Atmosphere
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The blanket of air 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 ocean.
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Continental Crust
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The crust which the continents rest on.
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Lithosphere
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A rigid layer 65 km to 100km deep.
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Asthenosphere
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The sphere just below the lithosphere.
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Plasticity
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The ability for a solid to flow.
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P waves
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Primary waves. they can travel through solids,liquids, and gases. they go faster through rigid materials.
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S waves
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Secondary waves. they can only travel through solids and aren't as fast as P waves.
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Weight
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The measure of the strength of the pull of gravity on an object.
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Newtons
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The way weight is measured in.
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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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