Across
- 1. Primary concern of surveyors determining borders and cities
- 3. Has steadily declined on Lake Superior
- 7. Species able to adapt to eating this fish survived
- 10. Aquifer drained by Great Plains farmers
- 11. Process for deepening navigation channels
- 13. Instantly sunk in a Great Lakes maritime disaster
- 14. Landmass that drains into the lakes
- 15. This species' digestion adapted to consuming mussels
- 18. Element found in Waukesha's miraculous water
- 19. These lake predators provide biotic resistance
- 20. Species favored for less expensive fishing
Down
- 2. Allows water to be piped to other cities and towns
- 4. Discovered on the St. Clair river bottom by the Georgian Bay study
- 5. Gene used for population reduction of a species
- 6. Lake with a violent current area known as "Death's Door"
- 8. Results in water loss from the lakes
- 9. State that supplies nearly all of the nation's lettuce
- 12. System proposed to retain water flow in dry years
- 16. Percent of the world's freshwater located in the Great Lakes
- 17. Used to control and adjust water levels