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Thicker continental crust displaces more of the asthenosphere than denser, thinner oceanic crust.Pieces of the lithosphere that move on top of the asthenosphere.Helps us understand how continents move.Ğxplains the large scale movement of Earth’s lithosphere which includes both continental and oceanic crust and the rigid, upper part of the mantle.Old crust destroyed at similar rates to which new crust is created, so Earth stays the same size.Ħ.Ocean trenches: dense oceanic crust sinks back into the asthenosphere.Sea-floor spreading: molten rock moves up through cracks in oceanic crust, creating new crust at mid-ocean ridges and pushing the sea floor apart, moving continents.Ěge and magnetic properties of sea floor.What evidence do we have for continental drift? Pangaea began to break apart 200 million years agoĥ.Single large landmass that contained all of the present-day continents.ğossils found on both sides of the Atlantic Ocean, in both South America and Africa.Mountain ranges that span continents (North America and Europe).What evidence do we have for Plate Tectonics? Inner core: solid, dense center of the Earthģ.Outer core: liquid layer of Earth’s core between mesosphere and inner core.Mesosphere: strong lower part of the mantle that flows more slowly.
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The core goes from below the mantle to the center of the Earth.Scientists can study the mantle by looking at mantle rocks that rise to the surface and seismic waves that travel through the Earth during earthquakes.The mantle is denser than the ¬¬¬¬¬¬¬crust but less dense than the core.Ĝontains more magnesium and less aluminum than the crust.Ĝonvection: movement of matter based on differences in density caused by temperature variation.The region of hot, slow-flowing, solid rock between the crust and core is called the mantle.Oceanic crust is thinner and denser than continental crust because it contains twice as much iron, calcium, and magnesium.Mostly made of oxygen, silicon, and aluminum.The outermost solid layer of Earth is the crust.What are the Earth’s compositional layers?
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