Answer:
Sea and land breezes occur due to the difference in the cooling rates of land and sea.
Sea breeze (occurs during the day):
During the day, land gains heat quicker than the sea. Air directly above land is thus heated up and rises due to expansion (larger volume, lowered density). Air from above the sea thus moves towards the land to occupy the space previously occupied by the air above land, from an area of high pressure to an area of lower pressure, forming wind.
Land breeze (occurs at nighttime):
At night/evening, land loses heat quicker than the sea. Air directly above the sea is thus warmer. It rises due to lower density. Air from above land thus moves towards the sea to occupy the space previously occupied by the air above the sea, from an area of high pressure to an area of lower pressure, forming wind.
The greater the temperature difference between the land and the sea, the stronger the wind.
