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Answered 2012-03-20 23:21:14

rift vally on land, and mid-ocean ridge under water

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Long deep cracks formed when plates separate?

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What are long deep cracks formed when plates separate?

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What are long cracks in earth where plates diverge?

A long crack in earth's crust where two tectonic plates diverge is called a Rift.


What is a rift eruption?

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Describe seafloor spreading?

Seafloor spreading is the process in which the ocean floor is extended when two plates move apart. As the plates move apart, the rocks break and form a crack between the plates. Earthquakes occur along the plate boundary. Magma rises through the cracks and seeps out onto the ocean floor like a long, thin, undersea volcanoes. As magma meets the water, it cools and solidifies, adding to the edges of the sideways-moving plates. As magma piles up along the crack, a long chain of mountains forms gradually on the ocean floor. This chain is called an oceanic ridge. The boundaries where the plates move apart are 'constructive' because new crust is being formed and added to the ocean floor. The ocean floor gradually extends and thus the size of these plates increases.


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It's called a "fault"


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Long crack that forms as two tectonic plates move apart?

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What happens when the Earth's crust splits apart and forms a valley?

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Rift, i beleive so.


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