higher levels of salinity in the ocean water stronger currents at the surface of the ocean cooled magma found on the edge of the plates greater reproduction levels for organisms at the bottom of the ocean
I gave my students this multiple choice question: Which would provide evidence of seafloor spreading?

Only one answer is correct among these 4 choices:
- higher levels of salinity in the ocean water
- stronger currents at the surface of the ocean
- cooled magma found on the edge of the plates
- greater reproduction levels for organisms at the bottom of the ocean

Could you tell me which one is correct?

cooled magma found on the edge of the plates