Earth’s Layers and Plate Tectonics Notes
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| crust | the outermost solid layer of the earth.
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| mantle | The thickest of Earth’s layers, is located between the core and the crust.
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| Convection | the movement of matter that results from differences in density caused by variations in temperature.
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| lithosphere. | the outermost, rigid layer of Earth, which includes the crust and the upper mantle.
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| asthenosphere | a layer of weak or soft mantle that is made of rock that flows slowly.
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| mesosphere | the strong, lower part of the mantle.
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| outer core | the liquid layer of the Earth’s 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 Earth.
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| Plate tectonics | a theory that states that Earth’s outer layer, the lithosphere, is broken into large, slowly moving pieces called tectonic plates.
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| Convergent boundaries | form where two tectonic plates collide.
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| Divergent boundaries | where two tectonic plates move away from each other.
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| Transform boundaries | where two tectonic plates move past each other horizontally.
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| continental drift | says that the continents were once joined together, and, over time, they broke up and drifted apart.
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| Pangaea | about 200-300 million years ago, the continents were joined in a single large landmass.
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| Laurasia and Gondwana. | about 200 million years ago, a large rift formed, and Pangaea began to break into two continents
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