a. False, Water vapor is always present in air in small proportion.
b. False, Water evaporates into air from oceans, rivers, lakes and also from the soil.
c. True. Evaporation is the process by which water changes into vapour.
d. False. The evaporation of water takes place in sunlight as well as wind.
e. True. Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
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