Question

what causes wind and how are clouds formed

Answer 1

Wind is caused by differences in atmospheric pressure created, in large part, by the unequal heating of the earth's surface by the sun.

Clouds are formed when moist, warm air rises and expands in the atmosphere. The rising water vapor condenses and forms small water droplets which make up the clouds.

Answer 2

Clouds form when the invisible water vapour in the air condenses into visible water droplets or ice crystals. There is water around us all the time in the form of tiny gas particles, also known as water vapour. There are also tiny particles floating around in the air - such as salt and dust - these are called aerosols.