Ocean water is salty. There are mountain ranges on the ocean floor. About 97 percent of Earth's water is ocean water. Fewer clouds block sunlight over the ocean.
I gave my students this multiple choice question: Which fact best explains why most evaporation happens in the oceans?

Only one answer is correct among these 4 choices:
- Ocean water is salty.
- There are mountain ranges on the ocean floor.
- About 97 percent of Earth's water is ocean water.
- Fewer clouds block sunlight over the ocean.

Could you tell me which one is correct?

About 97 percent of Earth's water is ocean water.