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Unit 6 & 7

Earth’s Layers and Plate Tectonics Notes

TermDefinition
crust the outermost solid layer of the earth.
mantle The thickest of Earth’s layers, is located between the core and the crust.
Convection the movement of matter that results from differences in density caused by variations in temperature.
lithosphere. the outermost, rigid layer of Earth, which includes the crust and the upper mantle.
asthenosphere a layer of weak or soft mantle that is made of rock that flows slowly.
mesosphere the strong, lower part of the mantle.
outer core the liquid layer of the Earth’s core.
inner core the solid, dense center of our planet that extends from the bottom of the outer core to the center of Earth.
Plate tectonics a theory that states that Earth’s outer layer, the lithosphere, is broken into large, slowly moving pieces called tectonic plates.
Convergent boundaries form where two tectonic plates collide.
Divergent boundaries where two tectonic plates move away from each other.
Transform boundaries where two tectonic plates move past each other horizontally.
continental drift says that the continents were once joined together, and, over time, they broke up and drifted apart.
Pangaea about 200-300 million years ago, the continents were joined in a single large landmass.
Laurasia and Gondwana. about 200 million years ago, a large rift formed, and Pangaea began to break into two continents
Created by: brainybunch6
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