Which statement about detecting mineral soil is accurate?

Which statement about detecting mineral soil is accurate?

• A. Mineral soil is detected by color alone
• B. Mineral soil is detected by soil pH testing
• C. Mineral soil is detected by removing duff and looking for exposed soil with no organic covering; color and texture differences indicate mineral soil
• D. Mineral soil can be assumed anywhere without examining

Answer: (C)

Detecting mineral soil means confirming the actual mineral layer beneath the organic cover, not just guessing from the surface. The reliable way is to remove the overlying duff and look at the exposed soil. When you clear the covering, you’ll see a distinct layer that has different texture and composition from the organic material—mineral soil typically feels more compact and sandy or gritty, while duff is loose, fibrous, and dark. Color alone can be misleading because the organic layer can share hues with mineral soil, and lighting or moisture can alter appearance. PH testing isn’t a practical or dependable method for identifying the mineral layer in the field. You can’t assume mineral soil is present everywhere without checking; the correct approach is to inspect by removing the duff and observing the exposed soil, using both color and texture differences to confirm it.

Detecting mineral soil means confirming the actual mineral layer beneath the organic cover, not just guessing from the surface. The reliable way is to remove the overlying duff and look at the exposed soil. When you clear the covering, you’ll see a distinct layer that has different texture and composition from the organic material—mineral soil typically feels more compact and sandy or gritty, while duff is loose, fibrous, and dark. Color alone can be misleading because the organic layer can share hues with mineral soil, and lighting or moisture can alter appearance. PH testing isn’t a practical or dependable method for identifying the mineral layer in the field. You can’t assume mineral soil is present everywhere without checking; the correct approach is to inspect by removing the duff and observing the exposed soil, using both color and texture differences to confirm it.