Slate, gneiss >_< go crazy
Marble and Quartzite
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.
The process of sedimentary rocks altering to metamorphic rocks is called metamorphosis.
Shale is a sedimentary rock, not a metamorphic rock.
An increase in pressure and / or temperature would be needed to convert a sedimentary rock to a metamorphic rock.
Erosion
The process of sedimentary rocks altering to metamorphic rocks is called metamorphosis.
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.
The process is; heat, and pressure.
Gneiss is an example of a metamorphic rock.
Shale that is exposed to high temperature and pressure and turned to slate is an example of the metamorphic process.
Shale is a sedimentary rock, not a metamorphic rock.
Metamorphic rock that resists chemical and mechanical weathering, for example, the rock gneiss.
An increase in pressure and / or temperature would be needed to convert a sedimentary rock to a metamorphic rock.
Erosion
No. Gneiss is a metamorphic rock.
a metamorphic rock is a rock that is formed from heat and pressure it can form from a sedimentary or igneous an example of a metamorphic rock is marble metamorphic rocks can have foliation like banding or layers.
Melting of the bulk of the metamorphic rock, then solidification from cooling, will form an igneous rock.