Changes: Dynamic Illinois Environments

From site:  Earth forces are continually at work causing change. Climate, land, and living things are all connected. They interact with each other in complex ways. Even a small change can start a chain reaction that, over time, has big effects. Scientists study how Illinois' environment has evolved over the last 500 million years and how it continues to change even today. This online version of the Illinois State Museum's natural history hall explores the scientific evidence for environmental change in Illinois.