New crust is continually being pushed away from divergent boundaries (where sea-floor spreading occurs), increasing Earth's surface. But the Earth isn't getting any bigger. What happens ...

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 ...