Which of the following types of studies was the most critical in proving that sea-floor spreading actually occurs?

Question

Quizplus · Accepted Answer

Paleomagnetic studies of oceanic crust provided the most critical evidence for sea-floor spreading. This is because they revealed the alternating magnetic stripes on either side of mid-ocean ridges, indicating that new oceanic crust was forming at these ridges and pushing older crust away. This was a strong confirmation of the sea-floor spreading theory proposed by Harry Hess in the 1960s. Mapping of the ocean floor during World War I also contributed to our knowledge of the ocean floor, but it did not directly prove sea-floor spreading. Mapping of glacial ice and drilling oil wells were not relevant to proving sea-floor spreading, and studying volcanic eruptions, while informative, did not directly provide evidence for sea-floor spreading.

Which of the Following Types of Studies Was the Most