AP BIOLOGY

Detailed explanation-1: -Clouds form when the invisible water vapor in the air condenses into visible water droplets or ice crystals. For this to happen, the parcel of air must be saturated, i.e. unable to hold all the water it contains in vapor form, so it starts to condense into a liquid or solid form.

Detailed explanation-2: -Condensation in the air. Air contains water molecules. Clouds exist in the atmosphere because of rising air. As air rises and cools, the water in it can “condense out, ” forming clouds.

Detailed explanation-3: -When the temperature of a place becomes high, more water starts to evaporate. As a result, more water vapours are formed. Then, on reaching a certain height, water vapour present in the air condenses to form tiny droplets of water. These water droplets collect to form clouds that float in the air.