Question

which evidence originally supported hesss idea of seafloor spreading in 1968?
○ younger rocks are closer to mid-ocean ridges.
○ the destruction of crust occurs at deep-sea trenches.
○ oceanic rocks are pillow - shaped when formed.

Explanation:

This was key original evidence for seafloor spreading: as new crust forms at mid-ocean ridges and spreads outward, rocks farther from the ridges are older, while those nearest are the youngest. The other options relate to seafloor processes but were not the core original supporting evidence for Hess's 1968 seafloor spreading model.

Answer:

Younger rocks are closer to mid-ocean ridges.