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The water cycle


Liquid water occupies oceans, lakes, rivers, dams, etc. Continuously and slowly, at room temperature, evaporation occurs, that is, water changes from liquid to gaseous state.

The larger the surface area of ​​water exposure (eg an ocean or tree leaves in a forest), the higher the evaporation level. When water vapor comes into contact with the cooler layers of the atmosphere, the water returns to its liquid state, that is, water droplets or even tiny ice crystals concentrate. forming clouds.

Water vapor, when cooled, can also form the fog (fog), that is, that "cloud" that forms near the ground.

When a very large accumulation of water forms in the clouds, the drops become larger and larger, and the water precipitates, that is, it begins to rain. In very cold regions of the atmosphere, water changes from gaseous to liquid and rapidly to solid, forming snow or hailstones.

Rainwater and melting snow seeps into the ground, forming or renewing groundwater. Groundwater emerges to the surface of the earth, forming the springs of rivers. Thus the water level of lakes, dams, rivers etc. is held.

Soil water is absorbed by plant roots. Through perspiration, plants eliminate water in the vapor state to the environment, especially through the leaves. And in the food chain, plants, through fruits, roots, seeds and leaves, transfer water to their consumers.

In addition to what is ingested by food, animals obtain water by drinking it directly. They return water to the environment by sweating, breathing, and eliminating urine and feces. This water evaporates and returns to the atmosphere. On our planet, the water cycle is permanent.

Water cycle