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Building Materials

Q1:

Gniess is obtained from

A igneous rocks

B metamorphic rocks

C sedimentary rocks

D sedimentary metamorphic rocks.

ANS:D - sedimentary metamorphic rocks.

Metamorphic rocks formed from the transformation of existing rock types by a process called metamorphism. Metamorphic rocks make form 12% of the Earth's land surface.

Common examples of metamorphic rocks are quartzite, gneiss, slate, schist, marble, etc.

Marble is a metamorphic rock formed from limestone.
Slate is a metamorphic rock formed from shale and mudstone.
Gneiss is a metamorphic rock formed from granite.
Graphite is a metamorphic rock formed from coal.



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