Ocean Basins
Ocean basins are the vast, low-lying regions of Earth's crust that hold the world's oceans, averaging roughly 12,000 feet (about 3,700 meters) deep, shaped over millions of years by plate tectonics. Their edges and interiors show that shaping directly: mid-ocean ridges are chains of underwater mountains where new seafloor forms and spreads apart, while deep ocean trenches, including the Mariana Trench's Challenger Deep at about 36,000 feet, the deepest known point on Earth, mark where one plate sinks beneath another.
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