Answers

2015-10-28T19:14:17+05:30
Rocks can be broadly classified into three types:
sedimentary
igneous
metamorphic rocks
rocks are important in making of many objects such as plates, jewelry. most houses are built with materials from rocks. some of the valuable rocks are graphite, slate, limestone etc. they help in the production of stationery and the building of houses. coal  which is taken from rocks can be used for gas. rocks are also used in the medicine industry.
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