Some shale becomes limestone and some changes into coal depending on what minerals are in them.
--http://library.thinkquest.org/05aug/00461/shale.htm
Shale and granite are sedimentary rocks. After thousands of years under pressure and heat, they can turn into phyllite rock.
Slate forms from shale under pressure.
under heat and pressure
Under the effects of pressure and temperature, shale can either melt into magma, become flattened, or create a bigger mineral.
With With enough heat and pressure, granite will become gneiss so long as it is not hot enough to melt the granite.
Gneiss
GNEISS
Shale and granite are sedimentary rocks. After thousands of years under pressure and heat, they can turn into phyllite rock.
Slate forms from shale under pressure.
under heat and pressure
Under the effects of pressure and temperature, shale can either melt into magma, become flattened, or create a bigger mineral.
With With enough heat and pressure, granite will become gneiss so long as it is not hot enough to melt the granite.
slate
Rock metamorphism.
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biusxx
marble