What best characterizes a desert? 

A)  It is an area where evaporation exceeds precipitation. 
B)  It is an area where most organisms are active during the day. 
C)  It is an area where most vegetation consists of grass. 
D)  It is an area where evaporation is slow.

Which of the following is a way that geology influences Rapid City and areas of the Black Hills, either presently or in the past?

A) flooding along creeks that drain the Black Hills
B) tilted rock layers that control the steepness of slopes
C) tourism from presidents' faces chiseled into granite
D) large gold deposits
E) all of these