Geography Unit 1 - H/O 1 - Assignment 3, pp 24, 28-37   1.      What is Albedo? (p. 24) 2.      Why does rain decrease during Ice Ages 3.      Why do scientists believe that periodic contractions and subsequent expansions of savanna regions caused human ancestors to evolve from “jungle-dwelling apelike animals?” 4.      What is, and what is causing, Global Warming? 5.      What is the importance of aquifers and fossil water? 6.      How much water is in the atmosphere at any one time? 7.      Why do wet climates often have very poor soil? 8.      Within the context of an ecosystem explain what an energy cascade is? - Define an ecosystem - Define Cascade 9.      How is the energy cascade effected as it moves through the food chain and webs, and what    does this mean to those at the top of the chain? - Define a food web 10.  Leopold said that even nutrients have become itinerant, what did he mean and why is it so       important? 11.  Why have humans become such global creatures and why is it important?