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close this bookBetter Farming Series 28 - Water: Where Water Comes from (FAO, 1981, 31 p.)
close this folderWhy we study water
View the document(introduction...)
View the documentRainfall
View the documentWater In the ground
View the documentThe water table
View the documentWater on the surface
View the documentEvaporation
View the documentTranspiration
View the documentThe process begins again


20. At certain times water evaporates from the surface of the soil or from swamps, lakes or streams. It becomes water vapour.

Water evaporates

21. We cannot see water vapour. We cannot use it. Water vapour rises into the air to form new clouds.