Earth science definition of stoping, stocks, emplacing and laccoliths?

Stoping: It is a geological process where surrounding bedrock is broken off to accommodate rising magma from the source in the mantle or the lower crust to the surface.

Stocks: They are igneous intrusions like batholiths, but smaller. The surface exposure is less than 100 sq km. They are composite bodies most likely fed by batholiths found deeper in the earth.

Emplacement: this refers to the intrusion of igneous rocks in older rocks. It may also refer to the development of ore or ore deposit.

Laccoliths: This is a sheet intrusion that is injected in between two layers of sedimentary rock. They are mushroom-shaped and have a flat floor and the roof is domed.

81 is a composite number.