ESCI 20000. EARTH SYSTEMS Earth systems are fundamental to our understanding of Earth and environmental sciences. ESCI 20000 investigates the complex interactions of earths spheres: atmosphere, biosphere, hydrosphere, geosphere, anthroposphere. Emphasis on cycles (hydrologic cycle, rock cycle), feedback loops (ice-albedo), and chaotic and fractal behavior within Earth systems (extinction, climate events). Study of the methods and principles employed in deciphering Earth history. Three hours of lecture and three hours of laboratory weekly. [MNS]