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Earth’s Layers and Plate Tectonics Notes

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Term
Definition
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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