​Rocks

On the basis of origin, and mode of formation, rocks may be classified into:

  1. Igneous,
  2. Sedimentary, and
  3. Metamorphic.

1. Igneous Rocks

  • These Rocks are formed by the cooling and solidification of molten silicate minerals (magma).
  • Igneous rocks include volcanic and plutonic rocks. These rocks are classified on the basis of texture and composition.
  • The major kinds of igneous rocks are Basalt, Gabbro, Andesite, Diorite, Rhyolite and Granite.

They are further classified on several other grounds as mentioned below:

I.On the basis of Silica Content

  1. Acidic Igneous Rocks have more silica e.g. Granites, Quartz and Feldspar.
    • These rocks have lesser contents of heavier minerals. Hence they are ....
Do You Want to Read More?
Subscribe Now
To get access to detailed content
Buy November 2024 Issue

Already a Member? Login here

Take Annual Subscription and get the following Advantage
The annual members of the Civil Services Chronicle can read the monthly content of the magazine as well as the Chronicle magazine archives.
Readers can study all the material before the last six months of the Civil Services Chronicle monthly issue in the form of Chronicle magazine archives.
Be an Annual Subscriber

Geography Of India