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Figure 2 is a drawing showing clouds, the wind, mountains, snow and ice, a river, fields, a forest, houses, a lake, groundwater flow, and the sea. There are volumes in tera cubic metres (1012 m3) against certain items:

atmosphere – 13

snow and ice – 26 000

infiltration – 150

lakes – 230

rivers – 1.7

groundwater flow – 7000

oceans – 1 350 400.

There are upward-pointing arrows indicating loss to atmosphere: evaporation from the lake; transpiration from the forest and fields; evaporation from precipitation (rain); and evaporation from the sea.

There are downward-pointing arrows for precipitation, surface run-off from the mountains and oceanic precipitation.

 1 The hydrological cycle