AIR AROUND US

  
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1.Air is present in atmosphere ,water and .

2. constitues the largest portion of air.

3. use carbondioxide to make food.

4. Air is present .

5. Air is a mixture of various gases, and dust particles.

6. The thick layer of air surrounds the earth is called .

7. The ratio of nitrogen to oxygen in air is

8. Air is a homogeneous solution which occupies space and is .

9. help in movement of windmills.

10. There is of oxygen at high altitudes.