 | Better Farming Series 28 - Water: Where Water Comes from (FAO, 1981, 31 p.) |
 |  | Why we study water |
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Evaporation
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.
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