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Ch 18
| Term | Definition |
|---|---|
| biomass energy | Energy that is produced from this material. |
| BIofuels | fuel from organic sources. |
| Biopower | electricity generated by the combustion of organic materials. |
| geothermal energy | a type of renewable energy that is generated deep within the earth; by the breakdown of radioactive elements. |
| ground-source heat pump | a network of pipes that circulates water from the ground. |
| hydropower | electricity generated from the energy of moving water |