Discussion
Black mineral colours in the soil are generally related to the presence of the following elements :
Answer: A
Black mineral colours in soil are generally related to the presence of manganese and iron, option A. Manganese oxides give black or dark brown colours to soils and iron compounds add dark shades, which is why these elements are used to explain dark coloured soil in forensic comparison. Copper minerals (B) are usually green or blue, chromium minerals (C) are green, and iron phosphate minerals (D) are bluish or whitish. Brown and red colours in soil are most often due to iron oxides.
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