Plates move together at a ______________________ boundary.

One plate is forced under another in a __________ zone.

A mid-ocean ridge is an underwater _______________ chain.

The rock in the continental crust is ________________ than the mantle.

Stress that occurs as something is pulled apart

What is formed where the plates pull apart under the ocean, making the crust between them thinner, and hot mantle rock pushes up?

Volcanic arcs form where two plates ___________________.

Where are active volcanoes most likely to form?

What type of boundary is the Great Rift Valley in Africa?

Why does seafloor spreading occur?

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