Concept explainers
What are the two processes by which rock is changed during metamorphism?
The two processes that the rock changed during metamorphism.
Answer to Problem 13TE
The two processes that the rock changed during metamorphism are contact and regional metamorphism.
Explanation of Solution
When a rock structure is encroached by magma, contact metamorphism takes place. A zone of alteration is created by the high temperature of the magma, which surrounds the encroachment. This alteration is maximum at the contact and decreases as moves away from the contact.
Another process of rock alteration is regional metamorphism. It occurs under the action of heat and pressure over the entire area of rock.
Conclusion:
Therefore, the two processes that the rock changed during metamorphism are contact and regional metamorphism.
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