Which outcome occurs when wind speed falls below the threshold needed to transport sand grains in a dune landscape?

💡 Explanation

Saltation ceases because the aerodynamic lift and drag forces are insufficient to keep grains airborne; therefore ripple formation stops because wind can no longer move material, rather than dune horns migrating or ridges broadening which require sustained periods of strong winds.

• What fallout risk increases downwind following explosive Hawaiian-style volcanic activity?
• Which mechanism limits upwelling within subtropical gyres despite persistent wind forcing?
• Which outcome arises where a low-gradient river encounters localized bank erosion during flood conditions?
• Which mechanism accelerates lake eutrophication when agricultural runoff contains excessive nutrients?
• Which seismic pattern emerges due to stick-slip behavior?
• Which displacement results from strike-slip motion along transforms?