Please choose the correct answer to the question: When a cold front moves over a land region that has warm, moist air, a transfer of energy occurs. Cold air sinks and pushes warmer air upward. As energy is removed from the air, which change will most likely take place?

Answer1: Ozone in the atmosphere will decrease. Answer2: Less ultraviolet radiation will reach the land. Answer3: More water will be absorbed from the area lakes. Answer4: Water in the atmosphere will undergo a phase change.

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