Question

how evaluation cause cooling

Answer 1

you increase in elevation, there is less air above you thus the pressure decreases. As the pressure decreases, air molecules spread out further (i.e. air expands) and the temperature decreases. If the humidity is at 100 percent (because it's snowing), the temperature decreases more slowly with height.

Answer 2

I think you mean to say EVAPORATION!

since, The remaining particles in the liquid have a lower average Kinetic energy than before, so the liquid cools down as evaporation happens. This is why sweating cools you down.
The sweat absorbs energy from your skin so that it can continue to evaporate.

in this way evaporation brings cooling!
hope it was helpful!