Answer:
The correct answer is D. 4,2,3,1
Explanation:
Shale is metamorphosed into three rock types( phyllite, schist and gneissic) a dull slate with cleavage, a rock with small mica crystals with a shiny aspect, a very shiny rock with large mica crystals and a banded gneissic rock.
Shales that are subject to heat and pressure of metamorphism alter into a hard, fissile, metamorphic rock known as slate. When metamorphic grade is continually increased the sequence is phyllite, then schist and finally gneiss.
Answer:
d. 4, 2, 3, 1
Explanation:
Shale is a type of sedimentary rocks, which is characterized by it fine-grained, fissile and laminated nature. It is formed through the mixing of silt and mineral particles often referred to as mud.
Shales are metamorphosed through the heat and pressure, into a hard fissile metamorphic rock known as SLATE. SLATE is characterized by it fine-grain nature with well developed rock cleavage or salty cleavage. Then it metamorphose to PHYLLITE, which is also characterized by its fine-grained mica flakes, and it contains quartz, sericite micas and chlorite. After PHYLLITE, the shale metamorphosed to SCHIST; identified by its coarse grain nature, with mica crystals that are large enough, to unaided eyes. From there, Shale metamorphosed finally to GNEISS; a branded rock, characterized by its medium to coarse grain nature, with poorly developed cleavage.
