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How long would a pebble take to reach the bottom of the Mariana Trench? © Getty Images

How long would a pebble take to reach the bottom of the Mariana Trench?

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The Mariana Trench is the deepest part of the ocean. So, if you were to drop something over board, how long would it take to reach the seabed?

Asked by: Merlin Hetherington, Spain

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Located in the Pacific roughly halfway between Japan and Papua New Guinea, the Mariana Trench is the deepest part of the ocean, and plunges down over 10,900m below sea level. A pebble dropped overboard would take just over an hour to reach the pitch-black seabed, where temperatures hover just above freezing and the pressure is over 1000 times higher than at the surface.


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Authors

Robert is a science writer and visiting professor of science at Aston University.

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