Geomorphic features observable in aerial photographs such as linear ponds, lineations in an alluvial deposit, and notches or saddles in the ridges are characteristic of which process?

• A. Faulting
• B. Erosion
• C. Glaciation
• D. Mass wasting

Answer: (A)

Glaciation leaves unmistakable patterns in the landscape that you can read from aerial photos. Linear ponds, lineations in glacial deposits, and notches or saddles in ridges all point to ice-moving processes shaping the land.

Linear ponds often form where meltwater pools in elongated depressions carved or widened by advancing and retreating ice along a glacier’s path or along morainal terrains. The water tends to fill troughs that run roughly in the direction of ice flow, giving a series of elongated water bodies.

Lineations in deposits are streamlined, elongated features created as the glacier dragged and reworked sediment. These glacial lineations point in the direction of ice movement and show how the ice physically reorganized the sediment surface as it flowed.

Notches and saddles between ridges are classic glacial landforms carved by erosion from moving ice. A notch is a narrow pass carved where ice preferentially eroded, while a saddle is a low point between two ridges left by the sculpting action of the glacier.

Together, these features reflect the directional erosion and deposition of a glacial system, not processes like faulting or simple erosion, making glaciation the best explanation for their presence.