We're sorry for the inconvenience, but some parts of the The Great Lakes section are broken and therefore unusable.
The Great Lakes were carved out of the earth by glaciers
during the last ice age - about 20,000 years ago. They have a tremendous
impact on many people's lives and health.
The Great Lakes ecosystem is constantly exposed to
new imbalances imposed by humans. The lakes serve as transportation
for ship and barge traffic. The ships and barges often carry animals
and plants from other places into the lakes.
Many cities and farms border the lakes. Fertilizers
and weed killers get into the lakes by running off from these farms
The water quality of the lakes is directly affected
by human activities. Because the lakes are so large, they have
a significant impact on local weather.
What's in this section?
- Name the Great Lakes.
- Determine the distance from student's residence to the Great
- Define "alien" (introduced) species.