A dead supercontinent is partly responsible for the ocean sinking into the Earth's mantle, explain researchers

(Natural News) Every day, hundreds of millions of gallons of water drain from the oceans into the Earth’s mantle, and geologists think that a dead supercontinent may be to blame. Dubbed the “deep water cycle” or the “geologic water cycle,” this phenomenon occurs when water gets soaked up by minerals within the earth’s mantle through a process called subduction....

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