1) Introduction
The diagram illustrates how water, which originates from seas and
oceans, goes through a natural cycle to produce rain and snow.
(The verb “illustrates” has introduced the task; two steps, the beginning, and
the ending, are mentioned based on the information from the diagram.)
2) Overview
Overall, the water from oceans and seas is evaporated to form clouds
before falling on the ground as rain and snow in different regions.
(The overview paragraph summarizes what
mainly happens in the cycle
without giving details.)
3) First body paragraph
Based on the given diagram, the runoff water, which mainly comes from
snow-capped mountains, groundwater, and the water from seas and
oceans, is evaporated by the heat from the sun, producing water vapor.
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