Question : Which one of the following is igneous rock ?
Option 1: limestone
Option 2: granite
Option 3: marble
Option 4: slate
Correct Answer: granite
Solution : The correct answer is granite.
Based on its formation, rocks are classified into three types- Sedimentary, Igneous and Metamorphic rocks. Sedimentary rocks are formed by deposition of various layer over a long period of time, igneous rocks are of volcanic origin and metamorphic rocks are formed under high pressure and temperature conditions inside the earth. Examples-
- igneous rocks- basalt, granite etc.
- sedimentary rocks- limestone, dolomite, sandstone etc.
- metamorphic rocks- gneiss, slate etc.
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