Question

1. All fuels burn in the presence of_______.
2._______ gas makes up only 0.03% of air.
3.______ gas is filled in weather balloons.
4. The mixing of harmful substances in air is called ______.
5._______ gas, when inhaled,combines with haemoglobin present in our blood.
6. Forest fires are a _______ cause of air pollution.
7. Carbon dioxide is a_______
gas.
8._______rain corrodes away metals,
rocks and monuments.​

Answer 1

Answer:

oxygen

------

helium

air pollution

oxygen

major

minor

acid

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Answer 2

Answer:

1) oxygen

2)

3)

4)

5) oxygen

6)

7)

8)