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Building Materials

Q1: The hardest rock is

A marble

B diamond

C talc

D quartz. <

ANS:B - diamond

Diamonds are not a rock. They are a mineral. Minerals are a "naturally occurring, inorganic (not alive) solid, they also have a crystal-shaped structure.

Rocks are a little different. They contain one or more minerals, but are not minerals themselves. Granite, for instance, is made of quartz and other minerals, often feldspar and biotite.



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