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The Summary Of The Stone
Jan 09, 2017

Stone, generally refers to the big rock mass in the external force and off small rock mass, much attached to the big rock surface, usually into squares or elliptic, appearance some rough, some smooth, is strong and rigid. Can be used to make stone tools, collection quarries. For thousands of years ago, our ancestors used stone to make a fire. A stone is composed of calcium carbonate and silica.