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Lesson 10 Air Around Us, , Answer the following questions., 1. Why do living things need air?, , Answer - Living things need air to breathe., , 2. List any three things that air contains., Answer - The three things that air contains, are , a) Water vapor, , b) Smoke and dust, , c) Germs, , 3. Give an example to show that air gives, shape to things., , Answer - When air is blown into a balloon, it's shape changes. This shows that air, , gives shape to things., , 4. Give an example to show that air has, weight., , Answer - A deflated ball becomes heavier, when air is filled in it. This shows that air, , has weight., , 5. Why should we keep the air clean?, Answer - We should keep the air clean, because breathing dirty air can make us ill., 2021-11-23, SN