| A | B |
|---|
| fossil fuel | a fuel that formed over millions of years from the remains of organisms |
| crude oil | oil from the ground before it is changed into other products |
| refinery | a place where crude oil is changed into various products |
| turbine | a machine with turning, fanlike blades that runs a generator |
| greenhouse effect | the trapping of heat by the air around the earth |
| acid rain | rain that forms when certain gases mix with water in the air |
| nonrenewable resource | a resource that cannot be replaced once it is used up |
| fission | splitting of the nucleus of an atom |
| nuclear reactor | a device built to produce and control nuclear energy |
| uranium | a heavy element used as a fuel for nuclear fission |
| 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 | a device that traps and stores solar energy |
| solar cell | a device that changes sunlight into electricity |
| geothermal energy | heat inside the earth |
