Across
- 4. a type of extraction that obtains natural gas by fracturing the rocks
- 5. a geographic area that has a common drainage location for water
- 8. the system in living organisms that regulates hormones and development
- 9. if the growth rate is 10 percent, then the doubling time is ___ years
- 10. the number of layers in the atmosphere BELOW the thermosphere
- 11. type of soil that has a relatively even mix of sand, silt and clay
- 15. a measure of the suspended particulates in water
- 16. an organism that gets impacted by bleaching
- 18. the type of growth demonstrated by a J-shaped curve
- 20. three of the answers to this crossword are numbers, put them in ___ order to get the code for the next lock
Down
- 1. a type of organism that gets its energy from the sun directly
- 2. the liquid that accumulates in landfills
- 3. a species that is not native to an area and causes problems for the local ecosystem
- 6. a type of power generated by moving water, usually in a dam
- 7. practices that will allow the repeated use of resources for generations without running out
- 12. the chemical name for natural gas
- 13. the amount of lead that is considered safe (a number)
- 14. the most efficient type of irrigation
- 17. protects us from UV rays in the stratosphere, but is a pollutant in the troposphere
- 19. the non-living components of an ecosystem.