It's an underwater chain of mountains 47,000 miles long. The chain runs down the middle of the Atlantic Ocean (surfacing at Iceland), around Africa, through the Indian Ocean, between Australia and ...

Keep an eye on the map to see where in the world the activity takes place. Also known as spreading boundary, a divergent boundary occurs where two plates move apart, allowing magma, or molten rock ...

The movement of the plates creates three types of tectonic boundaries: convergent, where plates move into one another; divergent, where plates move apart; and transform, where plates move sideways ...