| A | B |
|---|
| fossil fuel | formed from remains of organisms |
| crude oil | oil from the ground before it's refined |
| refinery | where crude oil is changed into various products |
| turbine | machine with fan-like blades that runs a generator |
| greenhouse effect | trapping of heat by the air around the earth |
| acid rain | rain formed when certain gases mix with water in the air |
| nonrenewable resources | cannot be replaced once they are used up |
| fission | splitting of the nucleus of an atom |
| fusion | putting atoms together |
| nuclear reactor | device built to produce nuclear energy |
| uranium | fuel used for nuclear fission |
| coal | an example of a fossil fuel |
| hydroelectric | generating electricity with moving water |
| tidal energy | energy in rising and falling tides |
| renewable resource | a resource that cannot be used up |
| solar energy | radiant energy from the sun |
| solar collector | traps and stores solar energy |
| solar cell | changes solar energy directly into electricity |
| geothermal energy | heat inside the earth |
| geyser | caused by geothermal energy |
