If a rock has shiny surfaces or bands of light and dark layers, then it is blank, which is a metamorphic texture that refers to flat or wavy planar features.

need to fill in the spot where it says "blank"? !

This breed is called metamorphic rocks - rocks formed in the Earth's crust as a result of metamorphism, ie the change of sedimentary and igneous rocks due to changes in physical and chemical conditions

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.