Consider the following statements about thermal metamorphism: 1. In regional metamorphism the rocks come in contact with hot intruding magma and lava and the rock materials recrystallise under high temperatures. 2. In contact metamorphism, rocks undergo recrystallisation due to deformation caused by tectonic shearing together with high temperature or pressure or both. Which of the above given statement is/are correct? |ForumIAS

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: D

Notes:

Explanation:

There are two types of thermal metamorphism — contact meta-morphism and regional metamorphism.
In contact metamorphism the rocks come in contact with hot intruding magma and lava and the rock materials recrystallise under high temperatures. Quite often new materials form out of magma or lava are added to the rocks.
In regional metamorphism, rocks undergo recrystallisation due to deformation caused by tectonic shearing together with high temperature or pressure or both.
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 or lineation.

Source: NCERT Class 11