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Question

The amount of usable water on earth is:
  1. Salt and water
  2. Salt and carbon dioxide gas
  3. Salt and nitrogen oxide
  4. Salt and nitrogen gas


Solution

The correct option is C Salt and nitrogen oxide
The amount of usable water on earth is limited as not all sources of water give usable water. Water present in oceans is too salty, much of the water is frozen in form of mountainous and polar glaciers. So, only a small portion is available for use.

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