Question

What do you mean by metamorphism ?​

Answer 1

alteration of the composition or structure of a rock by heat, pressure, or other natural agency.

"all the rocks were subjected to several phases of metamorphism and deformation"

Answer 2

$<b> metamorphism is a change in the  structure or constitution of a rock due to  natural agencies, as  pressure and heat, especially when the  rock become sharder and  more completely  crystalline</b>$