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. [MNS]