The answer may be B, but i may be incorrect.
Surface, crust, mantle, and core
Yessss I'm great at geography... what grade level?
No it does not effect the temperature of the earth.
Answer:
100% sure it's A, a crack forms in oceanic crust
Explanation:
It happens in the following order-
1. a crack forms in oceanic crust
2. molten rock rises up through oceanic crust
3. molten rock solidifies at the center of the ridge
