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.