In the mid-twentieth century, researchers dredging the seafloor could not find any materials older than ________.

Name: In the mid-twentieth century, researchers dredging the seafloor could not find any materials older than ________.
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The seafloor spreading theory and plate tectonics explain why materials older than about 180 million years are not found on the seafloor. This is due to the continuous process of oceanic crust being formed at mid-ocean ridges and destroyed at subduction zones.

In the Mid-Twentieth Century, Researchers Dredging the Seafloor Could Not