P waves is moved by compressing and expanding.
S waves is form perpendicular angle when they pass.
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
During the early earth, when photosynthesis has not yet evolved, there were only negligible amounts of free oxygen in the atmosphere. It was said that the Earth's atmosphere had no free oxygen then. This is about 3.5 billion years ago.
Answer: The atmosphere today contains more greenhouse gas molecules, so more of the energy emitted by the surface ends up being absorbed by the atmosphere. Since some of the extra energy from a warmer atmosphere radiates back down to the surface, The Earth's surface temperature rises.
