Question

why does land cools down faster than water at night?

Answer 1

Because of Land and Sea Breezes 
The land heats and cools more rapidly than does the sea. Water retains heat longer than land, and also takes longer to heat and cool. 
This causes temperature differences between the land and the sea, which leads to a thermal circulation (or wind based on temperature differences). 

During the day, the land gets hotter faster, and the hot air rises, creating an area of lower pressure. Wind blows from the sea to the land. This is a sea breeze. 

At night, the land cools off faster than the sea. Cooler air descends creating an area of higher pressure. Wind blows from the land to the sea.

Answer 2

The land heats and cools faster as compared to the water body as water retains the heat for long as compared to the land.

Explanation:

• The heat retention is different in land as well as the water thus this creates the temperature differences between the land and the water.
• This leads to the thermal circulation between the land and the water.
• During the day the land absorbs the sunlight energy and the land gets hot. The hot air rises and the area of low pressure is created. The wind blows from the water body to the land. This creates breeze.
• During the night the land cools faster than the water. The cooler air descends which creates an area of higher pressure. The wind blows from the land to the water body.

Learn more about air circulation:

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