Question

The most prominent feature of ocean topography discovered in the 1960s was:

1) volcanic activity at the ocean bottom
2) a submerged mountain ridge
3) seamounts
4) subduction zones

Answer 1

submerged mountain ridge

Step-by-step explanation:

cause it is

Answer 2

Volcanic

The most prominent feature of ocean topography discovered in the 1960s was: Volcanic activity at the ocean bottom. The continents have always been in their current positions.

hope it helps :)