| Answer | Crossword Clue |
|---|---|
| PEAT | Decayed matter used as fuel |
| PEAT | Decayed plant material used as fuel |
| PEAT | Plant matter used as fuel. |
| PEAT | Vegetable matter used as fuel |
| methanes | a colorless odorless flammable gaseous hydrocarbon CH4 that is a product of decomposition of organic matter and of the carbonization of coal, is used as a fuel and as a starting material in chemical synthesis, and is the simplest of the alkanes |
| BIOMASS | Organic matter used for fuel |
