The diagram below shows the water cycle, which is the continuous movement of water on, above and below the surface of the Earth.

The process gives us information about the evolution of water on our planet, with its different stages.

Overall

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, we can see that water always follows the same movements. It changes its physical state twice;

firstly

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, we have evaporation, and

then

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precipitation.

Due to

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this

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, we can continue to have H2O to consume. In evaporation, the ocean plays a crucial role; in fact, it contributes 80% of the total H2O vapour in the air. All

this

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vapour evaporates because of its high temperature, and

then

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the condensing vapour makes a cloud; at

this

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state, it is again in a liquid state, ready to go back down. After a cloud has been made, precipitation takes place;

in other words

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, it rains. Small drops fall on the mountains or in the lakes; those that precipitate on the mountains go down below the ground to arrive at the ocean and

then

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restart the same process.