What's the name of this mining machine?
loader
An area with a large amount of one material is called a ______.
deposit
What are the three different ways materials can be extracted?
open-pit mines, underground mines, or drilling
_____ _______ are used for materials that are near the surface of the crust.
open-pit mines
_______ ____ use shafts and tunnels to extract materials from deep inside the crust.
underground mines
________ uses a deep hold to extract gases or liquids from inside the crust
drilling
