Clouds are formed when

A. Sunlight causes water droplets to evaporate

B. Liquid water condenses on grass and windows

C. Raindrops freeze into tiny pellets and fall to earth

D. Water vapor in the air condenses to form liquid water or ice

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.

Clouds are formed when;

D. Water vapor in the air condenses to form liquid water or ice

Clouds form when warm and moist air rise and expands in the atmosphere. Water vapor condenses into small pieces of dust, which later conjoins to form a cloud.