Across
- 4. a fee that the government charges polluters for each unit of greenhouse gas they emit
- 6. a mineral that crystallizes in different forms because of differences in temperature or other conditions
- 8. this green energy source is electricity generated from the movement of waves
- 11. this circulation pattern is when warm. less salty water moves along the surface while cool, salty water moves deep below the surface
- 13. this green energy source is produced from organic materials
- 16. this type of management is a customized approach to managing resources that has been developed through scientific testing
- 17. this type of logging removes dead trees following a natural disturbance
- 18. a chemical compound derived from oil that is used to make plastics, detergents, and other products
- 20. the amount of a crop produced in a given area
Down
- 1. this source of pollution comes from many places over a large area
- 2. the separation of a solid substance from a solution
- 3. the raising of fish for food in controlled environments
- 5. a forest that has never been logged
- 7. the waste produced in processing ore
- 9. a system where the government determines an acceptable amount of a specific pollutant and then assigns (via permits) a fraction of that amount to industrial sources of the pollutant
- 10. a huge warehouse or pen designed to deliver energy-rich feed to livestock or poultry
- 12. a spongelike formation of rock, sand, or gravel that holds water
- 14. one or more rows of trees or other tall plants along the edge of a field to prevent wind erosion
- 15. the physical and chemical processes that break down rocks and minerals into smaller particles
- 19. a soil conservation method in which two or more crops are planted in one field