Which property significantly reduces lahar flow velocity in volcanic valleys?

💡 Explanation

Sediment deposition increases flow path length, lowering average fluid velocity via increased frictional resistance, which is an instance of momentum dissipation because lahar momentum is dispersed by solid bedload transport, therefore, the flow decelerates, rather than maintains speed with reduced friction or different temperatures.

• Which consequence results when extensive hydraulic mining unearths large loess deposits?
• Which outcome directly follows increased sediment deposition rates diminishing fjord depth?
• Which outcome accelerates subsidence in heavily irrigated alluvial basins?
• Which outcome sharply increases the sediment load in streams draining karst regions?
• Which outcome results from Earth's rotation altering prevailing winds' direction?
• Which mechanism drives the formation of faceted ventifacts?