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Watch the video that sums up the contents of the entire unit

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Use this interactive landscape to explore four types of plate tectonic activity

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Divergent Boundary

A divergent (or spreading) boundary occurs where two plates move apart. Magma, or molten rock, rises from Earth's interior to fill the gap.

Earth's longest mountain range is an underwater chain 40,000 miles (65,000 km) long. It runs down the middle of the Atlantic Ocean (surfacing at Iceland), around Africa, through the Indian Ocean, between Australia and Antarctica, and north through the Pacific Ocean. Along the top of this ocean ridge is a deep crack, called a rift valley. Here, magma wells up from Earth's interior. Cooled by the sea, it solidifies into rock, creating new ocean floor.

In the North Atlantic ridge, 0.75 inches (2 cm) of new floor is created each year. In the East Pacific rise, the rate is 12.5 inches (32 cm) per year.

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A divergent (or spreading) boundary occurs where two plates move apart. Magma, or molten rock, rises from Earth's interior to fill the gap. Earth's longest mountain range is an underwater chain 40,000 miles (65,000 km) long. It runs down the middle of the Atlantic Ocean (surfacing at Iceland), around Africa, through the Indian Ocean, between Australia and Antarctica, and north through the Pacific Ocean.

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check out your comprehension

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I created this video with the YouTube Video Editor (http://www.youtube.com/editor)

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Find out the main types of boundaries and their function

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Now click on the following link and do the quiz

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The form Earth Layers quiz is no longer accepting responses. Try contacting the owner of the form if you think this is a mistake.

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2. Look at the picture and revise the names of the layers

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2. Look at the picture and revise the names of the layers

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1. A Difference between crust and lytosphere 

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1. A Difference between crust and lytosphere 

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Watch the video and find out the different layers of the Earth

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Plate tectonics: Difference between crust and lithosphere | Cosmology & Astronomy | Khan Academy