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13 Cards in this Set
- Front
- Back
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Crust
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the crust is the outermost solid shell of a rocky planet or natural satellite, which is chemically distinct from the underlying mantle.
***felsinc |
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Mantle
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The mantle is a highly viscous layer between the crust and the outer core.
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Core
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composed mainly of an iron and nickel alloy. Outer = liquid. Inner = solid
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Mohorovicic discontinuity (MOHO)
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the boundary between the Earth's crust and the mantle.
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Upper Mantle
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upper mantle: the inner asthenosphere composed of plastic flowing rock about 200 km thick
***Mafic: olivine like |
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Lower Mantle
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lowermost part of the lithosphere composed of rigid rock about 50 to 120 km thick.
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Transition Zone
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it physically separates the upper and lower mantle.
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Ultramafic Rocks
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rocks are igneous and meta-igneous rocks with very low silica content (less than 45%),
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Low Velocity Zone
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(LVZ) occurs close to the boundary between the lithosphere and the asthenosphere in the upper mantle. It is characterized by unusually low seismic shear wave velocity compared to the surrounding depth intervals.
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Geothermal Gradient
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is the rate of increasing temperature with respect to increasing depth in the Earth's interior. Away from tectonic plate boundaries, it is 22.1°C per km of depth
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Earth's Magnetic Field
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proves plate tectonics. Magnetic seafloor striping.
earths magnetic field reverses. it comes from the outer core being liquid and it has the ability to convect. |
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Lithosphere
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utermost shell of a rocky planet. On Earth, it comprises the crust and the portion of the upper mantle that behaves elastically on time scales of thousands of years or greater.
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Asthenosphere
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one of the Earth’s mantle lying beneath the lithosphere, believed to be much hotter and more fluid than the lithosphere. The asthenosphere is thought to extend from about 60 mi (100 km) to about 450 mi (700 km) below the Earth’s surface.
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