Which phrase describes how metamorphic rocks form

Metamorphic rocks are created physical alteration or chemical alteration by the heat and pressure.

Explanation:

Metamorphic rocks are the always the original materials to that breakdown materials can above it cause the rock content metamorphic.

Metamorphic rocks are the schist and the marble materials to the product of metamorphic granite.Metamorphic rock to the response conditions are the environmental change in the various temperature and chemical components.Metamorphic rock are derived that the sedimentary rock and igneous rock that have to change physical environment.Metamorphic rock is do not crystallize by the silicate melt,under the temperature pressure condition.Metamorphic rock temperature, pressure and conditions is very widely and this type is very large.Metamorphic rock plant is to the continental plates to strike the regional metamorphism .Metamorphic rocks are complex to the physical and chemical process that operate micrometers.Metamorphic rocks are the process igneous and strongly depend the composition of basaltic.Metamorphic pressure the crust less then regions to the continental.

It is the second answer