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Rocks — Geography STD 9 — Question

ICSE BoardEnglish MediumSTD 9GeographyRocks4 Marks
Question
Distinguish between Thermal metamorphism and Dynamic metamorphism.
✓

Answer

Thermal metamorphism : When the transformation of the original rock takes place principally because of the influence of high temperature, the rock is said to be caused through Thermal metamorphism. For example, graphite (from coal) and slate (from clay). The heat may result from the intrusion of hot magma or from the friction of moving rock layers. It may also occur due to chemical changes.
Dynamic metamorphism : When the transformation of the original rock takes place mainly because of the influence of pressure at a great depth within the earth’s crust, it is known as Dynamic Metamorphism.

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