Question 1
What material in the soil serves a similar role to that of clay because of its ion exchange capacity, ability to store water, and ability to bind particles together?
◦ calcium carbonate
◦ humus
◦ caliche
◦ plinthite
Question 2
Which diagnostic epipedon is associated with the fertile soils of the central U.S., is dark in color, humus-rich, and has good structure?
◦ ochric
◦ histic
◦ mollic
◦ plaggen