The correct answer is d) Crystalline.
The basement of Kerala’s geology is made up of gneiss, granite, and other metamorphic rocks. These rocks were formed when the Indian Plate collided with the Eurasian Plate millions of years ago. The collision caused the rocks to melt and recrystallize, forming the basement rocks that we see today.
Limestone is a sedimentary rock that is formed from the accumulation of calcium carbonate. It is not a major rock type in Kerala.
Sandstone is a sedimentary rock that is formed from the accumulation of sand. It is not a major rock type in Kerala.
Granite is an igneous rock that is formed when magma cools and solidifies. It is a major rock type in Kerala.
Metamorphic rocks are formed when existing rocks are subjected to heat and pressure. They can be formed from any type of rock, including igneous, sedimentary, and metamorphic rocks. The basement rocks of Kerala are metamorphic rocks.