1: (a) Storm, 2: (b) Direction, 3: (c) Vacuum, 4: (c) Water droplets, 5: (d) All of these, 6: (a) Oxygen, 7: (b) Nitrogen, 8: (c) Oxygen, 9: (c) Oxygen, 10: (d) Fine hair and mucus
Air is all around us. We need air to breathe. We cannot survive without air even for a couple of minutes. The Air is a mixture of gases and water vapour. About 78% of air contains nitrogen and 21% contains oxygen. Remaining portion of air is composed of other gases.