Surface, crust, mantle, and core
Answer:usually a wall or a bridge seperates another country
Explanation: hope i helped
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
Answer: The Earth's crust that formed these mountains was once covered with an ocean
