Please choose the correct answer to the question: On a warm sunny afternoon, ocean water splashed onto a rock. A short time later, the rock was dry. Which statement best explains what happened to the water on the rock?

Answer1: Heat caused the water to become a gas. Answer2: Heat melted the water and it disappeared. Answer3: Salt caused the water to become a gas. Answer4: Salt melted the water and it disappeared.

Answer format: answer1/answer2/answer3/answer4
Answer: answer1