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

Metamorphic Grade

The intensity of heat and pressure conditions that have altered a rock, affecting its mineral composition and structure during the process of metamorphism.

Banded Gneissic Rock

A metamorphic rock characterized by alternating light and dark mineral bands, indicating high-grade metamorphism.

Mica Crystals

Minerals characterized by their sheet-like structure and ability to split easily along flat planes, commonly found in igneous and metamorphic rocks.