Across
- 2. natural light, primary energy source for photosynthesis
- 3. essential elements in animal nutrition
- 5. carbonized plant matter, used as fuel
- 6. mineral composed of pure carbon, most popular gemstone
- 7. limbless cold-blooded vertebrate animal with gills and fins
Down
- 1. Area where water covers soil
- 4. dark material consisting of a mixture of organic remains
- 5. plant products grown in large amount and harvested for profit
- 7. complex living system made up of trees
- 8. nonrenewable natural resource, recovered from natural gas deposits