Answers

2015-08-21T20:19:27+05:30

coal : it is mainly used in power plants to make electricity.  granite: It is widely used as crushed stone for concrete aggregate, road metal, railroad ballast, etc  sandstone: Used principally for construction

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2015-08-23T15:29:18+05:30
Metals are extracted from rocks
rocks are used to make rock salt
rocks are used to build houses bridges

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