Physiography of India

Geography (CDS)

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The Indian Peninsula is formed essentially by a great complex of very ancient gneisses and granite, which constitutes a major part of it. With reference to “Gneisses” which of the following statements is/are correct?

1. Gneisses are a result of high temperature and high pressure metamorphism.

2. Gneisses are distinguished by the presence of bands and strips.

Select the correct answer using the code given below:

1 only

2 only

Both 1 and 2

Neither 1 nor 2

Explanation:

The word metamorphic means ‘change of form’. These rocks form under the action of pressure, volume and temperature (PVT) changes.

In the process of metamorphism in some rocks, grains or minerals get arranged in layers or lines. Such an arrangement of minerals or grains in metamorphic rocks is called foliation.
Sometimes minerals or materials of different groups are arranged into alternating thin to thick layers appearing in light and dark shades. Such a structure in the metamorphic rocks is called banding and rocks displaying banding are called banded rocks.
Gneisses are a result of high temperature and high pressure metamorphism.
Gneisses are distinguished by the presence of bands and strips.

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