Grade 2 Science : The Water Cycle

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Information about Grade 2 Science : The Water Cycle
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Published on March 8, 2014

Author: croods

Source: slideshare.net

What is the water cycle? Did you know that there is no new water on Earth? It all gets recycled and reused in a process that we call the water cycle. The water cycle is a way that water moves all around the Earth. It never stops and doesn't really have a beginning or an end. It's like a big circle.

THE WATER CYCLE

The water cycle is made up of four main parts: Evaporation, Transpiration, Condensation, And Precipitation. Water cycle stages provide an explanation of water cycle. Let us understand each stage one by one. . .

Evaporation is when the sun heats up water in seas, rivers, lakes, ocean and glaciers and turns it into water vapor or steam and rises up into the air/atmosphere. Water is also evaporated through plants and soil through a process called transpiration. The water vapor cannot be seen with naked eyes.

Water even evaporates from plants. This is called transpiration. Plants, such as trees, lose water out of their leaves after they have absorbed water from the ground. The rate at which water will evaporate or transpire from plants depends on the temperature, wind, and humidity.

As the water vapor rises higher into the air /atmosphere, it cools and condenses. Condensation means that water changes from a gas (water vapor or steam) to liquid (water droplets) forming the clouds in the sky. Clouds contain million of tiny droplets of water.

The water keeps condensing to form clouds, but when there is too much accumulation or collection of water in these clouds, the clouds become heavy. This means the air can no longer hold this much amount of water, and the water starts to fall back to the earth in the form of rain. If the atmosphere is cold enough, the form of precipitation changes from rain to snow and sleet.

Collection/ Water storage In the last stage, rain or melted snow flows back into water bodies like seas, rivers, lakes, and glacier. Rainwater is also soaked up by the soil, through a process called infiltration. Some of the water also runs off the surface or seeps in the ground, which may later be seen as groundwater. Eventually the water reaches the oceans, which are the largest water bodies and the biggest source of water vapor.

Referrences: http://ellerbruch.nmu.edu/classes/cs255f02/cs255s tudents/abarker/P4/watercycle.html http://www.kidzone.ws/water/ Created by: Maria Lucelle D. Santiago BEEd 3-2 day

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