Explanation:

Explanation: Soil color is produced by the minerals present and by the organic matter content.  Yellow or red soil indicates the presence of oxidized ferric iron oxides. Dark brown or black color in  soil indicates that the soil has a high organic matter content. Wet soil will appear darker than dry soil.
Four main factors influence the colour of a soil:
1. Mineral matter derived from the constituents of the parent material.
2. Organic matter.
3. The nature and abundance of iron.
4. Moisture content.
Their colour is mainly due to ferric oxides occurring as thin coatings on the soil particles while the  iron oxide occurs as haematite or as hydrous ferric oxide, the colour isred and when it occurs in the  hydrate form as limonite the soilgets a yellow colour.