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How the Ocean Works

Paving the Seafloor—Brick by Brick

Most of Earth’s crust is manufactured at the bottom of the sea. Deep beneath the waves and beyond our view, magma erupts along a 40,000-mile volcanic mountain chain that bisects the ocean floors and encircles the globe. The lava flowing from these mid-ocean ridges solidifies into new ocean crust that spreads out and paves the surface of our planet.

Paving the Seafloor—Brick by Brick

Voyage to Vailulu’u

It was like a pirate’s treasure map. A dotted line clearly showed the trail, but…