Question

To  prevent  the  evaporation  of  water  from  lakes
_______ is  sprayed  on  the  surface  of  the  w'ater.

MSCERT Class 7 General Science Ch 2 Water - A Natural Resource

Answer 1

To prevent the evaporation of water from lakes chemicals like fatty alcohols (periodically) is sprayed on the surface of the w'ater.

Answer 2

To prevent the evaporation of water from lakes chemicals like fatty alcohols is sprayed on the surface of the water.