How many tectonic plates does Earth have?

How many tectonic plates does Earth have?

Billions of years ago, Earth’s surface was a sea of molten rock. As this simmering magma gradually cooled, it formed a continuous, rocky shell, with the denser minerals coalescing toward the planet’s interior and the less-dense minerals rising to the surface.

“That is how the plates formed at the surface of the Earth,” Catherine Rychert, a geophysicist at the Woods Hole Oceanographic Institution in Massachusetts, told Live Science. “The plate is the crust, then a bit of the mantle beneath it …. Beneath that you have weaker material.”

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