Picture a bathtub with the drain open and the faucet going, geologist Norman Lasca suggests, to better understand how the watertable and soil conditions interact under conditions of potential flooding. Later in “Folding, Flooding and Faulting: How the Earth is Shaped” he compares the rumpled effect of pushing the sheet of a bed to the folding of the earth’s materials under heat and pressure, into hills and villages. Throughout his presentation Dr. Lasca takes the complex processes involved in flooding and in mountain-building and breaks them down into their individual components.
Biologist Arthur Brooks in this lecture highlights the interplay of human activity and its impact on the Great Lakes ecosystem over a 200-year period. Utilizing diagrams and high-speed photography, Professor Brooks also discusses the food web of the Great Lakes and gives numerous examples of how exotic species alter the balance within an ecosystem.