re: Need help. If the center of the earth is so hot why is the bottom of the ocean so cold?

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bottom of the ocean still isn't very close to the center of the Earth.

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So what are volcanoes and hot springs? Why don’t we have a giant sea jacuzzi? If the earth is so thick, how do volcanoes have magma, and if there are indeed underwater volcanoes, shouldn’t there be atleast one area that has constant warm water?