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jun 1, 1961 - Robert S. Dietz-1961 Harry Hess-1962 Seafloor Spreading.

Description:

Over millions and millions of years, the seafloor of our planet spreads apart by sinking and rising, causing earthquakes causing a shallow mid-ocean ridge.

Britanica.com
Nationalgeographic.org

Added to timeline:

Date:

jun 1, 1961
Now
~ 65 years ago

Images: