Plate Tectonics
Presentation
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Science
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9th - 12th Grade
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Practice Problem
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Medium
+1
Standards-aligned
Gina Treat
Used 71+ times
FREE Resource
15 Slides • 9 Questions
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Plate Tectonics
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Plate tectonics
The Earth's crust is broken up into pieces called plates.
The crust moves because of movements deep inside the earth.
The movement of the plates, and the activity inside the Earth, is called plate tectonics.
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Convection currents
Heat rising and falling inside the mantle creates convection currents generated by radioactive decay in the core.
The convection currents move the plates.
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Divergent plates:
Where convection currents diverge near the Earth's crust, plates move apart.
This is called a spreading center or rift valley.
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Convergent plates:
Where convection currents converge, plates move towards each other.
The plate that moves under is subducted.
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Plate boundaries
Plate tectonics cause earthquakes and volcanoes.
The point where two plates meet is called a plate boundary.
Earthquakes and volcanoes are most likely to occur either on or near plate boundaries.
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Pangaea
About 300 million years ago, Earth didn't have seven continents, but instead one massive supercontinent called Pangaea,
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Plate Tectonics
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