Which soil horizon benefits from increased nutrient turnover when intense bioturbation occurs?

💡 Explanation

Increased bioturbation enriches the A horizon (topsoil) because organisms mix organic matter and minerals, thus creating a fertile layer; therefore plant growth is most immediately promoted in horizon A, rather than horizons where nutrients have leached out or where their concentration is naturally lower.

• Which climatic effect results when persistent stationary upper-level systems disrupt Hadley cell circulation?
• Which outcome occurs when disruption amplifies within Hadley cells?
• Which mechanism contributes to the deflection of geostrophic currents near ocean basin western boundaries?
• Which process amplifies stream incision when tectonic uplift increases base level fall rates significantly?
• Which process primarily governs water salinity stratification within a fjord?
• Which topographical outcome results when Freeze-thaw weathering drives solifluction processes?