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During World War II Harry Hess discovered A. earthquakes B. trenches C. volcanoes D. igneous rocks on the seafloor; evidence of seafloor spreading.
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During World War II Harry Hess discovered

A. earthquakes
B. trenches
C. volcanoes
D. igneous rocks
on the seafloor; evidence of seafloor spreading.

User Nilinswap
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D. Igneous rocks
He discovered “flat top mountains” on the Pacific Floor.
User Priya Singhal
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