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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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Seismograph

Machines that measure seismic waves when an earthquake occurs. This helps seismologists calculate the density and thickness of the physical layers of earth.