Assertion: lithosphere's crust | /r/HasProperty | recycled in the earth's mantle
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text: However, considering that throughout the geological history of the Earth there was never a change in its circumference, Hess supposed that somehow older seafloor had to be consumed somewhere else, and theorized this hypothetical process would take place at oceanic trenches, where the crust would be melted and recycled in the Earth's mantle.