Trypsin activity 100
80
Relative reactivity
60
40
20
0
2.0
4.0
6.0
8.0
10.0
12.0
0.0
pH

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the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.