Geography • Physical GeographyMedium
Which of the following describes an esker in glacial geomorphology?
A. A long, winding ridge of stratified sand and gravel deposited by meltwater streams within or beneath a glacier✓ Correct Answer
B. A sharp-edged ridge separating two adjacent glacial valleys
C. An isolated boulder transported and deposited by a glacier of a different rock type
D. A bowl-shaped amphitheater depression eroded at the head of a glacier
💡 Solution & Explanation
An esker is a long, sinuous ridge composed of stratified sand and gravel deposited by glacial meltwater streams flowing inside sub-glacial tunnels. Glacial landforms such as arêtes represent sharp mountain ridges formed between corries, whereas erratic boulders are transported rocks distinct from local bedrock geology. Understanding glacial depositional features is essential for solving topographical map and physical geography questions.
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