Enjoy with Social Life-4 [74-105] - School Books Publishers India

3. Why are dams called multi-purpose projects?Ans. The dams are used for storing water, controlling flood, generatingelectricity, developing fishing grounds and providing water ways fornavigation, so they are called multi-purpose projects.4. What is a dam?Ans. A dam is a barrier made of cement and iron over a river to control theflow of water.5. How is water of a river taken to irrigate distant fields?Ans. Canals or artificial water ways are built near the river so that the riverwater is diverted towards the far off fields for irrigation.Project/Activity :E. Try to find out the dams built in your state and write what purposesthey serve?Ans. Do yourself.10. Our Mineral ResourcesExerciseA. Fill in the blanks :1. Minerals are found in the form of ores.2. Iron is a metallic mineral.3. Coal is a non-metallic mineral.4. Natural gas is used for cooking.5. Minerals are very useful for us.B. Write True or False :1. Minerals are found in the form of ores. True2. Coal, mica and petroleum are metallic minerals. False3. Copper is a hard metal. False4. Coal is called 'black diamond'. True5. Mineral oil is called crude oil. TrueC. Choose the correct word given in the brackets :1. Iron is a (cheap / costly) mineral.2. Mica is a (metallic / non-metallic) mineral.3. Aluminium is a (soft / hard) mineral.4. Coal is known as black (gold / diamond).5. Minerals are (renewable / non-renewable) resources.D. Answer the following questions :1. What are minerals?Ans. The substances that are found deep in the earth are called minerals.2. What are mines?Ans. The land or the rocks are dug deep and big holes are made to take outthe minerals. These holes are called mines.3. What is called mining?Ans. Digging out of minerals from the earth's surface is called mining.4. Name two metallic minerals.Ans. Iron, copper are two metallic minerals.333386Bookman India Enjoy with Social Life [1-5]3