Техническая информация


World of Rocks
World of Rocks

It is being guessed that earth, one of the 9 planets arroud sun, is 4,6 billion years old. Humans live on earth since the last 50.000 years of this period.

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Physical Properties of Minerals
Physical Properties of Minerals

It is very important to define the physical and chemical properties of rocks before usage of them. So that it is determined if the rock is suitable for purpose of usage or not.

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