| A | B |
|---|
| electricity | Today, most coal is burned to produce... |
| fossil fuels | Fuels formed from the remains of plants and animals that lived long ago are called... |
| natural gas | The fossil fuel that releases the most heat when it is burned is..l |
| plants and animals | The main energy resources before 1900 were... |
| refinery | Crude oil is separated into different parts at a ... |
| conserve | We can make fossil fuel supplies last longer if we ... |
| kerogen | One possible fossil fuel source is ... |
| renewable | A resource that can be replaced within a person's lifetime is called... |
| nonrenewable | Because fossil fuels take millions of years to form, they are called... |
| acid precipitation | The oxides of sulfur and nitrogen can combine with rainwater to produce... |
| catalytic converters | The amount of pollution released by cars and trucks can be reduced by using... |
| pollution | The burning of fossils fuels can cause air... |
| reclamation | The replacing of rock and soil after mining is known as... |
| strip mining | The removal of soil and rock above a coal seam is called... |
| wind patterns | Acid rain can fall far away from where it is formed because of ... |
