Plate Tectonics peardeck

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Plate tectonics

Volcanoes, earthquakes, mountains, and other features of Earth’s surface owe their origin to the movements of plates: enormous, slowly-moving sections of Earth’s crust. At plate boundaries, plates collide, move apart, move under or over each other, or slide past one another. The theory of plate tectonics describes how the plates move, interact, and change the physical landscape.

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The Plate Tectonics Gizmo shows a cross-section, or side view, of Earth. (Not to scale.) Above the cross section is a bird’s-eye view of the same location. Label the Cross section view and the birds eye view on the image to the right

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• Turn on Show labels. The lithosphere is a layer of rigid rock that consists of the crust and the upper part of Earth’s mantle. The asthenosphere is a layer of the mantle that can deform like plastic.
• Label the layers on the image

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• Turn on Boundary name, and click on each boundary. Diagram on the map where you find each
• Transform (Red)
• Convergent (yellow)
• Subduction (green)
• Divergent (Blue)

What happens when plates slide past one another?

• Boundary A is a transform boundary. The arrows below the BOUNDARY A label will move the plates. Click the left arrow and right arrow to see what kind of motion happens in a transform boundary.
• How would you describe the motion of a transform boundary? Explain or diagram it on the image

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What happens when two continents collide?

• Boundary B is an example of a convergent boundary, where two plates are moving toward one another.
• When the two converging plates both contain continental crust, it is called a collision zone.
• Click the left arrow four times to see how the plates move.

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How would you describe the motion of plates in a collision zone? Explain and diagram on the image

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What happens when ocean crust collides with continental crust?

• Boundary C is another type of convergent boundary called a subduction zone. Click the left arrow four times to see how the plates move.

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How would you describe the motion of plates in a subduction zone? Explain and diagram on the image

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How is new crust formed?

• Boundary D is a divergent boundary. Click the right arrow four times to see how the plates move.

How would you describe the motion of plates in a divergent boundary?

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Plate tectonics - Summary

Volcanoes, earthquakes, mountains, and other features of Earth’s surface owe their origin to the movements of ___________: enormous, slowly-moving sections of Earth’s crust. At plate boundaries, plates _______, move _______, move ______ or ______ each other, or slide past one another. The theory of ____________________describes how the plates move, interact, and change the physical landscape.

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