Ch 17; L 1 & 2

True or False: Fossil Fuels are formed from the remains of once-living organisms.

Fossil fuels are produced only when the remains of living things are broken down in an environment that has little to no _______________

What fossil fuel comes from microscopic animals and algae?

• oil

• coal

• natural gas

Where did the energy in fossil fuels originally come from?

• the dirt

• the sun

• rock

• the air

One of the methods for removing coal that involves deposits that are close to the surface is __________________mining

________________mining is used to reach underground deposits of coal

___________forms from plant remains that are compressed under very high pressure.

• coal

• oil

• natural gas

Coal is commonly used as an energy source because it is _________expensive and more abundant

______________is the source of fuels used for most forms of transportation.

Oil taken from the ground is called crude oil. It must be _____________in order to be usable.

• refined

• extracted