What is a rock?
NCERT Class 7th Social Science (Our Environment) Chapter 2 Inside our Earth
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Rock make up the majority of Earth's crust.It is usually defined as a mixture of common minerals.Rock can be hard or soft,as small as a grain or as large as building.There are many kinds of rocks,as they can be classified in number of ways.Geologists classify rocks based on how the rocks are formed.
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