water is a kind of substance & if a substance absorbs solar energy then that substance will increase in temperature & water absorbs solar energy in the water cycle ->  water absorbing solar energy will increase in temperature  water absorbing solar energy will increase in temperature & temperature is a measure of heat energy ->  water absorbing solar energy will increase in heat energy  water absorbing solar energy will increase in heat energy & evaporation means a substance changes from a liquid into a gas by increasing heat energy ->  water absorbing solar energy will change water into gas state  water absorbing solar energy will change water into gas state & water is in the gas state , called water vapor ->  water absorbing solar energy will change water into water vapor  water absorbing solar energy will change water into water vapor & sun radiation is similar to solar energy -> water absorbing sun radiation will change water into water vapor