Which mechanism explains sediment layering in glacially-formed proglacial lakes with seasonal meltwater inflow?

💡 Explanation

When glaciers melt seasonally, alternating coarse (summer) and fine (winter) sediment layers are deposited because fluvial systems carrying sediment become less active during winter, leading to varve formation. Therefore varve formation by cyclic deposition is the answer, rather than chemotaxis, capillary action, or density currents which involve different stratification and mechanisms.

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• Which risk increases during the earthquake cycle phase known as the interseismic period at a subduction zone?