| Elastic energy (7) |  |
| Kinetic energy (2) | |
| Potential energy (2) | |
| Radiant energy (1) | |
| Elastic energy (7) | |
| Kinetic energy (2) | |
| Potential energy (2) | |
| Radiant energy (1) | |
Biofuels are a type of combustible matter holding potential energy in the form of carbon that was bonded chemically in the recent past (when considered on a geologic time scale.
Poplar is a potential energy crop for the biofuel industry because the tree grows quickly and on marginal farmland.
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