Which mechanism causes terraced hillsides in arctic regions experiencing seasonal thaw?

💡 Explanation

Seasonal thawing of permafrost causes the active layer to saturate with meltwater, reducing its shear strength; therefore, solifluction occurs due to gravity, creating lobes and terraces as soil slowly flows downslope. So terraced hillsides result, rather than wind erosion, chemical weathering or tectonic uplift which require distinct processes.

• Which geological feature develops when regional extension causes a series of parallel normal faults?
• Which risk increases when an earthquake causes liquefaction in an alluvial fan delta region supporting infrastructure?
• Which mechanism is disrupted by El Niño events, causing widespread marine ecosystem effects?
• Which habitat alteration occurs when earthworm introduction causes changed soil structure?
• Under what circumstance would significant overwash initiate barrier island migration?
• Which outcome occurs when wave energy is focused by headland refraction?