Exploring Motion at Plate Boundaries

Keith Meldahl explains the major motions at tectonic plate boundaries: divergent, convergent, and transform. Divergent boundaries, like mid-ocean ridges, involve plates separating and magma forming new ocean floor. Convergent boundaries, marked by ocean trenches, involve subduction, causing earthquakes and volcanic arcs. Transform boundaries, such as the San Andreas Fault, involve plates sliding past each other, resulting in earthquakes. The video concludes with a summary of these processes, highlighting the creation and destruction of the Earth's crust.

What is the main feature of a divergent boundary?

• Plates sliding past each other

• Plates remaining stationary

• Plates colliding

• Plates separating

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What forms along mid-ocean ridges due to volcanic eruptions?

• Limestone

• Pillow lava or pillow basalt

• Granite

• Sandstone

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What marks the location of convergent boundaries?

• Rift valleys

• Deep ocean trenches

• Mid-ocean ridges

• Mountain ranges

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What is the process called when one plate dives beneath another?

• Divergence

• Convection

• Subduction

• Transformation

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What is formed when the mantle melts due to subduction?

• A rift valley

• A transform fault

• A mid-ocean ridge

• A volcanic arc

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What is the main activity at transform boundaries?

• Earthquakes

• Volcanic eruptions

• Mountain formation

• Ocean floor spreading

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Which famous fault in California is an example of a transform boundary?

• Hayward Fault

• Denali Fault

• San Andreas Fault

• New Madrid Fault

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What happens to the ocean floor at mid-ocean ridges?

• It remains unchanged

• It is created and spreads

• It is destroyed

• It forms mountains

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What eventually happens to the ocean floor created at mid-ocean ridges?

• It becomes part of the continental crust

• It forms new islands

• It remains at the surface

• It is consumed in the Earth's mantle

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What is the overall process described in the video?

• Sedimentation

• Mountain building

• Weathering and erosion

• Plate tectonics

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