C) 30 miles is the correct answer
(I’m not sure but I think so)
I am almost positive that the answer is A. freezing
They form in the ocean where undersea volcanoes are errupting. The magma turning into lava piles up on top of itself over lots of time to form land.
The relationship of latitude to climate zones is due to solar radiation which is greatest near the Equator and lesser moving to the poles.