Sunday, February 7, 2010

. How does the presence of ocean ridges and trenches support the theory that the continentals move?

Continental drift is were the continents are ';plowed'; through the sea. The idea that the seafloor itself moves (and carries the continents with it) as it expands from a central axis was proposed by Harry Hess from Princeton University in the 1960s. The theory is well-accepted now, and the phenomenon is known to be caused by convection currents in the plastic, very weak upper mantle, or asthenosphere.

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