Question

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



seamounts

subduction zones

volcanic activity at the ocean bottom

a mountain ridge which circles the earth

Answer 1

@Secret-Ninja

Answer 2

http://en.wikipedia.org/wiki/Plate_tectonics
http://pubs.usgs.gov/gip/dynamic/developing.html
These two link mostly talk about seafloor spreading. I couldn't find much else. :/ Sorry.

Answer 3

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