Download - DO NOW
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DO NOW
• Take out last night’s homework – Continental Drift vs. Sea-Floor Spreading handout
• Turn to your neighbor and share your answers with your neighbor.
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PLATE TECTONICS
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Plate Tectonics• The idea that Earth’s surface is broken into
plates that slide slowly across the mantle• Mantle- the layer beneath the Earth’s crust
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Tectonic Plates
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Tectonic Plates
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What causes the plates to move?• Convection currents caused by magma
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The Lithosphere and Asthenosphere
• The crust and the layer of the upper mantle that form plates are called the lithosphere
• They rest on the upper mantle called the asthenosphere
• Earth has two kinds of crust: continental crust and oceanic crust– Continents are made of continental
crust, which is made up of rocks that are less dense than oceanic crust
– The ocean floor is made up of oceanic crust, which is made up of rocks that are more dense than continental crust
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What is a plate boundary?
• Plate boundaries are where the edges of plates meet
• There are three types of plate boundaries• The type of boundary depends on whether
the plates are moving toward each other, separating, or sliding past each other
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Three Types of Plate Boundaries
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Plate Boundaries
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Divergent Boundaries
• Divergent boundary- form where plates diverge, or move away from each other
- These boundaries are under oceans and build undersea mountain ranges called mid-ocean ridges
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Divergent Boundaries
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Convergent Boundaries
• Convergent boundary- form where plates collide -The pressure and violence at
convergent boundaries produces mountains, bands of volcanic activity, and deep ocean trenches
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Convergent Boundaries• Oceanic and Continental Crust Convergent
Boundary
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Convergent Boundaries• Continental and Continental Crust Convergent
Boundary
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Convergent Boundaries• Oceanic and Oceanic Crust Convergent Boundary
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Transform Fault Boundaries
• Transform fault boundary- form where two plates slide past each other - As plates smash and grind past
each other, there are many earthquakes
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Transform Fault Boundaries