Natural Resources – Air, Water and Land - Standard 6 - General Science - Balbharati
Natural Resources – Air, Water and Land Exercise Q.1 Fill in the blanks. (a) The layer of ozone gas absorbs ultraviolet rays that come from the sun to the earth. (b) Of the total water available on the earth, fresh water forms 0.3 percent. (c) Both abiotic and biotic constituents are present in the soil. Q.2 Why is it said that –? (a) The ozone layer is a protective shell of the earth. Ans. The ozone layer is like a protective shield around the Earth. It absorbs harmful UV rays from the sun, keeping us safe from their harmful effects. It plays an important role in protecting all living organisms on our planet. (b) Water is life. Ans. Living organisms cannot survive without water. The blood of animals and the sap of plants also have a high proportion of water. Therefore water is said to be life. (c) Seawater is useful even though it is not potable. Ans. Even though we can't drink seawater, it is still very useful in many ways:...