At the end of the last Ice Age, around 10,000 years ago, the melting of massive glaciers may have done more than just raise ...

That ridge, it was later discovered, extended through the major oceans of the world. It is now called the Mid-Ocean Ridge ... of the world's earthquakes and volcanoes occur at the plates' edges.

Mountains and volcanoes rise along the seam. The process renews the ocean floor and widens the giant basins. A single mid-ocean ridge system connects the world's oceans, making the ridge the ...

Volcanoes and earthquake activity often ... These zones include: the Pacific Ring of Fire around the Pacific Ocean the Mid-Atlantic Ridge, a mid-ocean ridge that extends along the floor of the ...