What might be present to cause a reddish color in a soil horizon?

Name: What might be present to cause a reddish color in a soil horizon?
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Question

Quizplus · Accepted Answer

Aluminum and iron oxides can cause a reddish color in a soil horizon. This is often seen in soils that have undergone weathering, as these minerals become more concentrated in the soil. Organic materials may cause a darkening of the soil, but not necessarily a reddish color. Bedrock and clay minerals are not necessarily associated with a reddish color in the soil.

What Might Be Present to Cause a Reddish Color in a Soil