Concept:Landforms are shaped by natural geomorphic agents that steadily erode, transport, and deposit earth materials.
Explanation:Rivers are major agents that carve valleys, create deltas, and build floodplains over time.
Glaciers move slowly and sculpt features such as U-shaped valleys, cirques, and moraines.
Waves act on coastlines to form cliffs, beaches, and spits through constant erosion and deposition.
Each of these agents works persistently and is recognized as a primary landform-producing agent.
Storms, on the other hand, are temporary weather events that may cause sudden erosion but do not create lasting landforms as a distinct agent.
Thus, among the given options, storms are not classified as a landform-producing agent.
Answer:C. storms