Soil color indicates what the soil is composed of and the climate under which it formed.

Question

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Soil color is used as an indicator of the soil's mineral composition, organic matter content, drainage conditions, and the climate under which it formed. For example, dark soils indicate a high content of organic matter, which is common in areas with high precipitation and vegetation growth, whereas reddish soils may indicate the presence of iron oxides, which can form in drier climates.

Soil Color Indicates What the Soil Is Composed of and the Climate