Water cycle

The picture illustrates the way in which water passes from ocean to air to land during the natural process known as the water cycle.

Overall, the process has different stages starting from when ocean water evaporates, falls as rain, and eventually runs back into the oceans again.

Beginning at the evaporation stage, 80% of water vapour in the air comes from the oceans. Heat from the sun causes water to evaporate, and water vapour condenses to form clouds. The second phase labelled ‘precipitation’ on the diagram take place when waterfalls as rain or snow. At the following stage in the cycle, rainwater may take various paths. Some of it may fall into lakes or return to the oceans via ‘surface runoff’. Otherwise, rainwater may filter through the ground, reaching the impervious layer of the earth. Salt water intrusion is shown to happen just before groundwater passes into the oceans to complete the cycle.

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Tham khảo bài mẫu của thầy Simon. Nguồn: http://ielts-simon.com/ielts-help-and-english-pr/2011/04/ielts-writing-task-1-water-cycle-essay.html