Question

Mention the differences between previous rocks and impervious rocks.

Answer 1

Previous rocks	Impervious rocks
1) Rocks that have cracks or pores in them and can contain water are called previous rocks.	1) Some rocks like granite. Kadapa limestone is very compact and doesn’t have pores in them. Water cannot enter into them. Groundwater usually accumulates above such rocks, Since the water cannot go beneath them, these are called impervious rocks.
2) In Andhra Pradesh we have a few districts like Prakasam where such rocks as sandstones are found.	2) Most of the rocks underlying the soil in our state are of this kind.