Types Of Rocks

What relationship explained by rock cycle between the major type of rocks?

________is a metamorphic rock form characterized by banding caused by segregation of different types of rock, typically light and dark silicates.

Radioactive decay provides an internal source of heat for the earth. This helps in the formation of which type of rocks ?

What does mica consists of? What per cent of the earth crust consists of mica? In which type of rocks is it found? Where is it used?