Answers

2016-03-27T11:41:51+05:30
When any substance evaporates, it requires energy.
This energy is taken by it from the surroundings.
This reduces the energy in the surroundings and cause cooling.
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2016-03-27T11:43:07+05:30
 evaporation is assist by cooling because when a liquid takes heat from the surroundings in the form of latent heat the heat from the surroundings goes to that liquid and makes the surrounding environment  cool . therefore we say that evaporation causes cooling

i hope it helps..... 
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