👉 Subcrustal is a geological term that refers to the outermost layer of the Earth's crust, generally located between the upper and lower plates. This layer is made up of various rock types such as basalt, granite, and gneiss. The subcrustal region is responsible for the deformation, movement, and weathering of the Earth's crust below it, which can have significant impacts on the overall structure and behavior of the land. The term "subcrustal"