The earth's longest mountain range is not on land, but underwater. This long mountain ridge is the Mid Ocean Ridge. It is where Earth's tectonic plates are slowly moving apart. It is 56,000 kilometers long! The mountains and valleys on it marks where the crustal plates are moving apart. The energy that makes this happen is from the heat in the earth's core created by radioactive decay. New crust under the ocean is created here. A lot of the earth's internal heat is released here.
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