The land absorbs more solar radiation and reflects a little while water reflects more solar radiation and absorbs a little. The differential heating of land and water is caused because of different rates at which the land and water are heated up. Land gets heated faster than the water. Therefore, during day land gets hotter than water. This results in wind blowing from sea to land during day. During night the land cools down faster and becomes cooler than the water bodies. This results in wind blowing from land towards the sea.