INNOVATIVE WORK

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          WATER CYCLE
The water cycle, also known as the hydrologic cycle or the hydrological cycle, is a biogeochemical cycle that describes the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time but the partitioning of the water into the major reservoirs of ice, fresh water, saline water (Salt Water) and atmospheric water is variable depending on a wide range of climatic variables. The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, surface runoff, and subsurface flow. In doing so, the water goes through different forms: liquid, solid (ice) and vapour
 .The stages involved in a complete water cycle are:

Stage I: Evaporation and Transpiration The sun’s energy heats up the lakes, rivers, oceans, swamps and other water bodies which subsequently increase the temperature of the water present in them. Consequently, some water evaporates as vapour into the air. The rising air currents take the vapour up in the sky. Simultaneously, plants and trees also lose water to the atmosphere in the form of vapour which rises up in the sky.
Stage II: Condensation As the vapours rise high, the cooler temperatures make them cool down and turn back into liquid – condensation. Wind and air currents move the moisture around, leading to the formation of clouds.
Stage III: Precipitation Wind movements cause the clouds particles to collide. As they become water laden, they develop into rain bearing clouds and fall back onto the earth’s surface by the process known as precipitation. This may occur in the form of rain, hail, snow or sleet depending upon the temperature conditions.
Stage IV: Runoff and Infiltration The precipitation either runs off into oceans, rivers and ground surface or is absorbed into the soil (infiltration).
Post the last stage, water is again ready to be evaporated and resume stage I. This is how the water cycle has been going on for billions of years, thus bringing fresh water to people, animals and plants, helping them survive all around the earth.


Materials required
  1.Thermocol
  2.fabric colours
  3.cardboard
  4.paper
  5.fevicol
  6.Sticks

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