Cengage Advantage Books: Sustaining the Earth 10th Edition by Tyler Miller,Scott Spoolman

تمرين 22

Review the Key Questions and Concepts for this chapter on p. 155. What percentage of the earth's freshwater is available to us? Define groundwater and explain how it is replenished. Define zone of saturation, water table, and aquifer. Distinguish among surface water, surface runoff, and reliable surface runoff. What percentage of the world's reliable runoff are we using and what percentage are we likely to be using by 2025? What is a watershed (drainage basin) ?