1. One factor that affects the explosivity of magma is the amount of dissolved gases it
contains, in particular the amount of

answer:

Water Vapor

Explanation:

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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.