Answer:
The rock cycle
Step-by-step explanation:
Earth’s internal heat engine, which moves material around in the core and the mantle and leads to slow but significant changes within the crust, and the hydrological cycle, which is the movement of water, ice, and air at the surface, and is powered by the sun.
The rock cycle is still active on Earth because our core is hot enough to keep the mantle moving, our atmosphere is relatively thick, and we have liquid water. On some other planets or their satellites, such as the Moon, the rock cycle is virtually dead because the core is no longer hot enough to drive mantle convection and there is no atmosphere or liquid water.