Fill in the blanks:

(a) The layer of air around the earth is called the …………… .

(b) Although we cannot see air, we can …………… it.

(c) Air is a …………… of gases.

(d) Plants and animals maintain the balance of …………… and …………… in air.

(e) Polluted air is …………… for health.

(f) The supporter of combustion in air is …………… .

(g) Green plants need …………… to prepare food.

(h) Oxygen is used in …………… of the food to get …………… .

(i) Aquatic plants and animals use …………… in water.

(j) The reddish brown powder on the surface of iron nails exposed to air and moisture is called …………… .

(a) The layer of air around the earth is called the atmosphere.

(b) Although we cannot see air, we can feel it.

(c) Air is a mixture of gases.

(d) Plants and animals maintain the balance of oxygen and carbon dioxide in air.

(e) Polluted air is harmful for health.

(f) The supporter of combustion in air is oxygen.

(g) Green plants need carbon dioxide to prepare food.

(h) Oxygen is used in digestion of the food to get energy.

(i) Aquatic plants and animals use dissolved oxygen in water.

(j) The reddish brown powder on the surface of iron nails exposed to air and moisture is called rust.