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Summary: Water - A Precious Resource Notes | Study Science Class 7 - Class 7

Document Description: Summary: Water - A Precious Resource for Class 7 2022 is part of Science Class 7 preparation. The notes and questions for Summary: Water - A Precious Resource have been prepared according to the Class 7 exam syllabus. Information about Summary: Water - A Precious Resource covers topics like How much water is available? and Summary: Water - A Precious Resource Example, for Class 7 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Summary: Water - A Precious Resource.

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Table of contents
How much water is available?
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How much water is available?
  • Earth’s surface is covered with about 71% of water.
  • Not all water is good for human consumption. The water fit to use is fresh water.
  • All water on the earth is contained in the seas and oceans, rivers, lakes, ice caps, as groundwater and in the atmosphere.
Water Forms
  • Water on earth can be maintained for millions of years by various processes which make water cycle.
  • Water circulates in water cycle which is found in three forms. They are:
    (i) Solid: Snow-covered Mountains and glaciers.
    (ii) Liquids: Oceans, lakes, rivers and underground.
    (iii) Gaseous: Water vapor in atmosphere.
Water cycle
  • It is also known as hydrologic cycle.
  • Water cycle describes the continuous movement of water on the surface or below the surface of earth.
  • The balance of water on earth remains fairly constant over time individuals water molecules can come and go in and out of the atmosphere.

Steps of water cycle

  • Ground water
  • Evaporation
  • Condensation
  • Clouds
  • Transpiration
  • Infiltration
  • Precipitation

Groundwater

  • Ground water is the large storage of water is inside the ground.
  • The water is located beneath the ground surface in soil pore spaces and in the fractures of rock formations.
  • Water table is the upper limit of layer.
  • Ground water is founds below the water table.
  • Infiltration: It is a process of seeping of water into the ground is called infiltration.
  • Aquifer: water which is stored between layers of hard rocks below the water table is called aquifer.

Depletion of water table

  • If water is not sufficiently replenished then water table may go down.
  • The reason is increasing population, industries, agricultural activities, decrease of seepage area for seepage of rainwater, deforestation and scanty rainfall.
Water management
  • Ground water that we get as rain fall just flows away. Rainwater is used to recharge the groundwater. This is referred to as water harvesting.
  • In India water storage and water recharge like the Bawris. It was the traditional way of collecting water.
  • Drip Irrigation is water saving Irrigation system. In this system, water falls on the roots of the plants drop by drop by the help of pipes.
  • We should turn off taps while bathing.
  • Map the floor instead of washing.
  • Use a bucket instead of bathtub.

Reasons for scarcity of water

  • Deforestation.
  • Uneven distribution of rainfall.
  • Scanty rainfall.
  • Increasing industries.
  • Increasing population rate.
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