History 4, chapter 4

Thin, light-colored oil used to light lamps and lubricate machines

What oil drilled from the ground took the place of whale oil?

When people stop work in order to get something like more money or better benefits:

What is the process to purify oil called?

What term is used when oil is applied to machinery parts to help them move more easily?

A resource that is used to make a product is called a _______.

A house in a row of houses built without any space between them:

A group of workers that unite to go on strike is called a ____________.

A set of rooms within a building that a person or family can rent to live in:

an underground railroad