| Fresh water (13) |  |
| Groundwater (12) | |
| Salt water (1) | |
| Saltwater (3) | |
| Water (437) | |
| Water column (1) | |
| Water quality (3) | |
| Water vapor (1) | |
| Fresh water (13) | |
| Groundwater (12) | |
| Salt water (1) | |
| Saltwater (3) | |
| Water (437) | |
| Water column (1) | |
| Water quality (3) | |
| Water vapor (1) | |
because burning hydrogen fuel emits only water vapor.""Many researchers are looking to inorganic materials for new sources of energy,
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