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.

• What amplified seismic event creates transoceanic tsunami waves following megathrust earthquakes?
• Which outcome occurs when intensive irrigation is applied?
• Which mechanism causes uplift and mountain formation along a reverse fault?
• Which risk increases when a large earthquake causes liquefaction in loosely packed, water-saturated soil?
• Which mechanism increases flood risk downstream of a newly formed oxbow lake?
• Which mechanism causes amplified tidal resonance in fjords?