Why Correct: Bergschrund is a deep crevasse formed at the head of a glacier where the moving ice pulls away from the stationary ice on the mountain wall. It is a glacial feature, directly linked to glacier movement.Distractor Analysis: River works include features like gorges, meanders, and deltas, not Bergschrund. Wind works include dunes, loess, and yardangs. Wave works include cliffs, beaches, and sea arches. Bergschrund is exclusive to glacial environments.Takeaway: Bergschrund (German: 'mountain cleft') is a diagnostic glacial feature; remember it alongside crevasses, seracs, and ogives for glacier geomorphology.

Why Correct: The Iranian Plateau is situated between the Elburz Mountains in the north and the Zagros Mountains in the southwest, covering most of Iran.
Distractor Analysis: The Arabian Plateau lies south of the Zagros, across the Persian Gulf. The Tibetan Plateau is far east, in China. The Anatolian Highland is in Turkey, west of the region.
Takeaway: Remember the sequence: Elburz (north) – Iranian Plateau – Zagros (southwest); the plateau is named after Iran, the country between these ranges.

Why Correct: Seifs are elongated, linear sand dunes oriented parallel to the prevailing wind direction. They are a classic aeolian landform found in sandy deserts like the Sahara.
Distractor Analysis: Deserts are the broader dryland environment, not a specific landform. Gulfs are water bodies indenting coastlines. Playa lakes are ephemeral, shallow lakes in desert basins.
Takeaway: Seifs, barchans, and transverse dunes are the three major dune types. Seifs are straight and parallel to wind; barchans are crescent-shaped and perpendicular.