Question: What properties of soil canwe infer based on the color of a particular sample?
Passage for the question: Soil colordifferences in a profile reflect soil-forming processes and can bean indicator of soil wetness. These differences help to distinguishfill from natural soil. Important coloring agents in soil includeparent (geologic) material, soil wetness, extent of leaching,content of organic matter, and the chemical form and content ofiron. Organic matter darkens the soil to a degree, depending on thecontent and the extent of decomposition. Iron gives soil a brown,yellow, or red color. Shades of blue or green may also appear,depending on iron amount, oxidation state, and hydration state.When soil is saturated, iron can become soluble and can be removed,leaving the soil with “mottled” brown and gray colors or completelygray colors, depending on the extent of the wetness