Question

water boils when it flows over molten rock at the base of a geyser. as the water boils, the rock beneath it cools down. complete the sentences. the rock heat, and the water heat as it boils. the water boiling is an process.

Explanation:

1. When the rock cools down, it is losing heat. So the rock "loses" heat.
2. For the water to boil, it needs to gain heat (absorb heat) to reach its boiling point. So the water "gains" (or "absorbs") heat as it boils.
3. Boiling is a process where a substance changes from liquid to gas, and for water to boil, it needs to absorb heat (endothermic process). So the water boiling is an "endothermic" process.

Answer:

The rock \boxed{loses} heat, and the water \boxed{gains} heat as it boils. The water boiling is an \boxed{endothermic} process.