GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Water cycle. Artwork showing an overview of the water cycle. The Earth's total water supply is estimated to be over 1.3 billion cubic kilometres. It is constantly redistributed by a variety of processes. Water evaporates from the ocean and may fall as precipitation over land (lower left, top). Water re-enters the atmosphere from land by evaporation and transpiration (water loss by plants) (top). Water flows from land to ocean in surface rivers and streams (centre). It also travels through soil and rock as groundwater (right). There is 30 times as much fresh water below ground than in lakes, rivers and inland seas.
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