| A | B |
|---|
| natural resorce | natural material used by humans |
| renewable resource | can be replaced at the speed it is used |
| nonrenewable resource | can't be replaced at the speed it is used |
| recycling | recovering materials from waste` |
| fossil fuel | formed from the remains of dead plants and animals |
| petroleum | liquid fossil fuel |
| natural gas | methane |
| coal | formed from dead swamp plants |
| acid precipitation | caused by pollutants in the air |
| smog | haze made when sunlight shines on air pollution |
| nucear energy | energy of the atom |
| fission | splitting of the atom's nuceus |
| fusion | joining of the nucei of atoms |
| solar power | energy of the sun |
| chemical energy | released during a chemical reaction |
| hydroelectric energy | electrical power made from falling water |
| biomass | energy from living things |
| geothermal energy | made by heat within the Earth |
