| Answer | Crossword Clue |
|---|---|
| recycles | Return (material) to a previous stage in a cyclic process |
| recycling | Return (material) to a previous stage in a cyclic process |
| recycled | Return (material) to a previous stage in a cyclic process |
| upstream | At a stage in the process of gas or oil extraction and production before the raw material is ready for refining |
| downstream | At a stage in the process of gas or oil extraction and production after the raw material is ready for refining |
