Which of the following types of studies was the most critical in proving that sea-floor spreading actually occurs?
A. Mapping of glacial ice in Greenland & Antarctica.
B. Studying volcanic eruptions around the Ring of Fire.
C. Drilling oil and gas wells on the continental shelves.
D. Paleomagnetic studies of oceanic crust.
E. Mapping of the ocean floor during World War I.
Answer: D
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