The Finely Divided, Red, Brown, and Yellow Soil- Coloring Minerals

Multiple Choice

The finely divided, red, brown, and yellow soil- coloring minerals originate by what process?

A) mechanical weathering of very fine- grained, blue- gray clays
B) mechanical weathering of the feldspars and micas in granite and rhyolite
C) precipitation of iron oxides during the chemical weathering process
D) chemical weathering of quartz and feldspars