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Choose the correct option. The total water

Choose the correct option. The total water Correct Answer of the world remains constant.

  • Earth is called the "Blue Planet" because it looks blue from space due to the presence of water on its surface.
  • About 71 per cent of the planetary water is found in the oceans.
  • The remaining is held as freshwater in glaciers and ice caps, groundwater sources, lakes, soil moisture, atmosphere, streams and within life.
  • Nearly 59 per cent of the water that falls on land returns to the atmosphere through evaporation from over the oceans as well as from other places.
  • The remainder runs off on the surface infiltrates into the ground or a part of it becomes a glacier.​​
  • Total water on earth is majorly divided into two parts:
    • Freshwater (2.5%)
    • Saline water (97.4%)

 

Water Balance:​

  • The total water of the world remains constant because the water travels through a cycle and the net amount never changes.
  • For example, the water which evaporates from various water bodies like lakes, rivers, ponds, etc form clouds and then they rain down filling up the same water bodies.
  • They also go underground but in the end, they end up in a water body thus completing the water cycle.

Hence, the total water of the world remains constant.

In the lakes and rivers of the world remains constant:

  • The amount of surface water changes from time to time with the changes in the rate of evaporation and precipitation.
  • For example during summers due to increased evaporation, rivers and lakes dries up and with the advent of rainfall, they are regenrated.

Under the ground remains constant:

  • The amount of water under the ground also changes depending on the soil cover.
  • Underground water eventually flows into lakes and rivers which is gain affected by seasonal patterns.

In the seas and oceans of the world remains constant:

  • The amount of water in seas and oceans are also affected by seasonal changes.
  • Furthermore, due to the ever-increasing climate change, the level of oceans is increasing due to the melting of ice.

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