| A | B |
|---|
| rain that contains harmful chemicals from pollution | acid rain |
| plant materials and animal wastes that can be used on fuel | biomass |
| a total loss of electricity across an area | blackout |
| something that is left over after the process of making something else | by-product |
| a pure substance that cannot be broken down into simpler substances | element |
| a fuel, such as coal, petroleum, or natural gas, that formed from the remains of prehistoric plants and animals | fossil fuel |
| a battery-like device that changes hydrogen gas into electricity | fuel cell |
| gas released when an engine runs on gasoline or oil | fumes |
| a machine that creates electrical energy | generator |
| energy produced by heat from below Earth's surface | geothermal energy |
| a hot spring or jet of steam that bursts upward from under the ground | geyser |
| an increase in temperatures on Earth and in the atmosphere | global warming |
| make use of | harness |
| an area that has had active volcanoes either in the past or the present | hot spot |
| a colorless gas mainly found in water | hydrogen |
