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Which evidence originally supported Hess’s idea of seafloor spreading in 1968?

A) Younger rocks are closer to mid-ocean ridges.
B) The destruction of crust occurs at deep-sea trenches.
C) Oceanic rocks are pillow-shaped when formed.
D) Rocks across the ocean floor have alternating magnetic stripes.

User Avaleske
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2 Answers

4 votes

Answer:

A

Step-by-step explanation:

User Lajosdeme
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5 votes

Answer:

The evidence that originally supported Hess's idea of seafloor spreading was that the younger rocks are closer to mid-ocean ridges.

Step-by-step explanation:

A is correct because Hess noticed that the rocks that are closer to the mid-ocean ridges are younger, and as their distance from the mid-ocean ridge increased, their age increased as well, thus giving him a clue that the seafloor is spreading.

B is not correct because Hess never managed to examine the deep-sea trenches.

C is not correct because Hess didn't have the means to be that close (in water) to a mid-ocean ridge where the new crust is formed so that he can witness it, and this was mainly due to the lack of proper equipment.

D is not correct because magnetic stripes indicate the positions of the poles throughout the geological past.

User Sdds
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