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Choose the correct option. The total water
(i) in the lakes and rivers of the world remains constant.
(ii) under the ground remains constant.
(iii) in the seas and oceans of the world remains constant.
(iv) of the world remains constant.
Correct answer: (iv) of the world remains constant.
Explanation: The total water of the world remains constant.
[Extra information: Water is a colourless, odourless, tasteless liquid. It comprises 70% of the earth's surface. Hydrosphere is the total amount of water present on a planet. Water resources are natural resources of water that are potentially useful. It is important because it is needed for life to exist. It makes up about 70 percent of our body content. Uses of water include agricultural, industrial, household, recreational and environmental activities. All living things require water to grow. Water is important for all living beings. Water can dissolve a large number of substances, so it is needed by the body. It is also a major part of our body cells. The freshwater stored in the ground is much more than that present in the rivers and lakes of the world.