What is associated with the presence of red and yellow in a soil horizon? 

A)  a high percentage of lime and gypsum 
B)  a lack of iron oxide 
C)  a low organic matter content 
D)  a high percentage of sand

Iron Oxide

A chemical compound made of iron and oxygen, commonly found in rust and various minerals, and used in numerous industrial applications.

Soil Horizon

A layer parallel to the soil surface, whose physical characteristics differ from the layers above and beneath, often classified by distinctive features such as texture and color.

Organic Matter

Material derived from the decay of plants and animals that provides nutrients for plants and increases soil fertility.