Flashcards in Plate Tectonics 4.1 Deck (17)
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2 ways scientists look at layers of earth
Composition and texture
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Crust
The thin and solid outermost layer of the earth outside the mantle
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2 types of crust
Oceanic and continental
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Oceanic crust
Made out of oxygen, silicon, and aluminum like continental but it denser because it has twice as much iron, magnesium, and calcium.
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Continental crust
Made of the elements silicon, oxygen, and aluminum but is less dense then oceanic
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Mantle
The layer of rock between the earths crust and core and is much thicker then the crust and contains most of the earths mass.
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Core
The central part of the earth below the mantle
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5 physical layers
Lithosphere, asthenosphere, mesosphere, outer core, and inner core.
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Lithosphere
The solid, outer layer of the Earth that consists of the crust and the rigid upper part of the mantle.
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Asthenosphere
The soft layer (plastic later) of the mantle on which the tectonic plates move. It flows slowly and is very hot but not hot enough to melt.
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Mesosphere
The strong, lower part of the mantle between asthenosphere and the outer core
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Outer core
The liquid layer of the earths core that lies beneath the mantle and surrounds the inner core
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Inner core
The solid, dense center of our planet that extends from the bottom of the outer core to the center of the earth.
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Tectonic plates
A block of lithosphere that consists of the crust and the rigid, outermost part of be mantle.
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How many major tectonic plates are there?
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Seismic waves
Vibrations caused from an earthquake that travel at different speeds through earth. Their speeds depend on what they pass through.
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