How does the water kept in an earthen pot (matka) become cool during summer?

Question 
How does the water kept in an earthen pot (matka) become cool during summer?

Solution
The earthen pot is porous with lot of pores on it, the water oozes out through these pores and the water gets evaporated at the surface of the pot thereby causing cooling effect. This makes the pot cold and the water inside the pot cools by this process.

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