Brown and red colors in subsurface horizons are caused by __ in the soil.
A)manganese
B)aluminum oxides
C)organic matter
D)clay
E)iron oxides

Question

Quizplus · Accepted Answer

Brown and red colors in subsurface horizons are typically caused by the presence of iron oxides, which form in the soil when iron is oxidized in the presence of oxygen and water. These iron oxides are typically responsible for the reddish-brown color that is often seen in soils with well-developed horizons.

Brown and Red Colors in Subsurface Horizons Are Caused by __