Shale is metamorphosed into three rock types: (1) a banded gneissic rock; (2) a rock with small mica crystals with a shiny aspect; (3) a very shiny rock with large mica crystals; and (4) a dull slate with cleavage. Which of the following lists these rocks in order of increasing metamorphic grade?
a. 1, 2, 3, 4
b. 4, 3, 2, 1
c. 2, 3, 4, 1
d. 4, 2, 3, 1
e. 3, 2, 4, 1

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.

the answer is option c.

explanation:

recycled water alludes to the water that being utilized again after it already  used for farming purposes.   this kind of water frequently contains pharmaceutical gathering due to the compound compost that is utilized for the plants is consumed into the water.