The Great Lakes System and The Dynamic Great Lakes

The Great Lakes System  click the link

the link is to wikipedia.  Below is The Dynamic Great Lakes with what lies beneath the freshwater seas.

Don't Do It In the Lake

The Great Lakes are Stressed

• Aquatic habitat alterations: Changes to aquatic habitat from diverse causes, such as shoreline hardening and erosion control structures, port and marina development, and tributary dams
• Climate change: Changes to seasonal, average, and extreme temperature, precipitation, and ice cover
• Coastal development: Land-based human development near lake margins, such as residential and commercial development and industrial activities
• Fisheries management: Changes to Great Lakes ecosystems resulting from fishing pressure, stocking activities, and aquaculture
• Invasive species: Changes to Great Lakes ecosystems from invasive and nuisance species in abundances not previously seen
• Nonpoint source pollution: Nutrients, sediments, and waterborne contaminants transported from watersheds to the Great Lakes by streams and rivers and atmospheric deposition
• Toxic chemical pollution: Chemical pollutants from industrial and agricultural sources