Task: Categorize the given words into three groups - natural resources, environmental concerns, and energy-related terms.
Natural Resources:
- Source
- Fossil
- Material
- Organic
- Chemicals
- Plant
- Animal
Environmental Concerns: 8) Pollution 9) Habitat 10) Acid 11) Toxic
Energy-related terms: 12) Carbon 13) Dioxide 14) Fuels 15) Renewable energy 16) Neutral
Please note that the word "rain" from the list doesn't fit into any of the given categories.
