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Civil Engineering PE

Category - Material QC

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Color often indicates what materials are contained within a soil. Which of the following color and characteristic combination is not correct?

Light or white = lime or sand
Brown or red = iron or iron oxide
Green = organic matter
Gray = poorly drained

Explanation

Answer: C - The color and characteristic combination of ‘green = organic matter’ is not correct. Soils that contain organic matter are usually very dark. Naturally occurring green soil is rarely encountered on the planet Earth, but may be indicative of an algae presence, overuse of soluble fertilizer, or toxic/hazardous waste.

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Civil Engineering PE

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