chapter  8
24 Pages


In this chapter we examine the next stage of the hydrologic cycle (Section 6.1). Evaporation was considered in Chapter 4, and the consequent atmospheric humidity in Chapter 6. Then Chapter 7 dealt with atmospheric instability, which is a major cause of uplift, often cooling air to its dewpoint temperature so that it is saturated and cloud forms. Now we will explain how this occurs, and some of the consequences.