Across
- 5. wetlands are formed by what when highway and dam construction, irrigation projects, or other activities alter drainage patterns or impound water.
- 8. oil spills near Gulf Islands National Seashore and airborne mercury or sulfur compounds at Acadia National Park are examples of what threat to wetlands?
- 10. Potholes, these provide breeding grounds for over 50% of North American waterfowl.
- 13. these wetlands account for most of the wetlands of the United States and are found throughout the country.
- 14. between 60% and 90% of U.S. commerce ____________ depend on wetlands.
- 15. wetlands along rivers and streams ___________ energy and store water during storms, which reduces downstream flood damage and lessens the risk of flash floods.
Down
- 1. some wetlands help provide clean, plentiful _________.
- 2. Plants, tamarisk at Canyon de Chelly National Monument is an example of what threat to wetlands?
- 3. wetlands act as natural water __________, filtering sediment and absorbing many pollutants in surface waters.
- 4. what binds the soil on streambanks and riparian wetlands, preventing excessive erosion and sedimentation downstream?
- 6. Deepwater Swamps, wooded wetlands of the southeastern U.S. that have standing water for most, if not all, of the growing season.
- 7. ______________ of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs.
- 9. large wetlands formed when _____________ dammed rivers, scoured valleys, and reworked floodplains.
- 11. the name for wetlands that form on floodplains where periodic flooding or high water tables provide sufficient moisture.
- 12. these wetlands are found along our nation's sea coasts within reach of the oceans' tides.
- 16. what fraction of endangered species in North America depend on wetlands for survival?