Answer:
4. Wind moves because air above land is cooler than air above water
Step-by-step explanation:
The land breeze is the movement of air from the land toward the sea. This air movement occurs during the night, when the land is quickly cooling off. As the land cools off, the air above it cools off quickly too. The air over the sea though cools off much slower and much less. The cooler air is denser than the air that is warmer, so it pushes the warmer air away, or rather the air from the land is moving toward the sea as a cool land breeze.