The grain size increases as pressure and heat act to recrystallize the minerals that already exist or form new minerals.
Grain size increases in the process of recrystallization.
Recrystallization
Grain size increases in the process of recrystallization.
Compaction
compaction
Answering "What process changes igneous rocks into metamorphic types?"Igneous rocks convert into metamorphic due to extreme pressure and heat, which can come from magma/lava or the movement of tectonic plates. For example, the igneous rock basalt eventually turns into the metamorphic rock granulite.
Broadly weathering, erosion, deposition, compaction and cementation.
Grain size increases in the process of recrystallization.
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Compaction
compaction
It begins with melting.
Erosion breaks down a metamorphic rock then the particles get deposited and get cemented or compacted together forming a sedimentary rock.
Answering "What process changes igneous rocks into metamorphic types?"Igneous rocks convert into metamorphic due to extreme pressure and heat, which can come from magma/lava or the movement of tectonic plates. For example, the igneous rock basalt eventually turns into the metamorphic rock granulite.
Broadly weathering, erosion, deposition, compaction and cementation.
Metamorphic rock "meta-morphs," or changes, from other rock forms, typically sedimentary, through a combination of heat, pressure, and of course time.
Heating and pressurization changes igneous and sedimentary rocks into metamorphic rock.
To change a sedimentary rock to a metamorphic rock, you change it by time,heat, and pressure.
When rock changes into metamorphic rock, its appearance, texture, crystal structure, and mineral content change.