Q: The rocks that are taken from a mine are full of valuable minerals plus rock that isn't valuable. what is this rock called?


Read this paragraph and choose the correct option from the provided answers:

Most minerals are a combination of metal and other elements. The rocks that are taken from a mine are full of valuable minerals plus rock that isn't valuable. This is called waste rock. The valuable minerals must be separated from the waste rock. One way to do this is with a chemical reaction. Chemicals are added to the ores at very high temperatures.

 Choices:

- garbage rock

- compost rock

- empty rock

- waste rock


A:
waste rock