The Finely Divided, Red, Brown, and Yellow Soil-Colouring Minerals Originate

Multiple Choice

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

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