BharatNotes Drumlin
noun (countable)Usage in a UPSC answer
The 'basket of eggs' topography of drumlins — aligned parallel to former ice-flow directions — provides palaeo-glaciologists with reliable proxy data for reconstructing Pleistocene ice-sheet dynamics in the Kashmir Himalaya.
Synonyms
Antonyms
Word Family
drumlin (noun), drumlinoid (adjective), drumlin field (compound noun), drumlinised (adjective, rare)
Root
Irish druim = ridge, back (of a hill); with diminutive suffix -lin; from Old Irish druimm
Etymology
The word entered English from Irish drumlín (diminutive of druim, ridge or back), first recorded in English geological literature around 1833. The term reflects the Irish landscape of County Down and Galway, where drumlins create the characteristic 'basket of eggs' topography. The formal glaciological definition was established in the 19th century as geologists mapped glacial deposits across the British Isles and North America.
Memory Hook
DRUM-lin: imagine an upturned DRUM laid on its side — smooth, oval, and elongated — pointing in the direction the glacier 'drummed' its way forward. The steep end faced the ice, the tail drifted away.
How This Word Works in UPSC Writing
A smooth, elongated hill of glacial till, shaped beneath moving ice and aligned with the direction of flow. Its diagnostic form is the asymmetry, a blunt steep stoss end facing the ice and a gently tapering lee end, which is why drumlin fields are read as indicators of former ice-movement direction. That interpretive use is what makes it examinable rather than merely descriptive.
Don’t Confuse It With
A drumlin is a depositional hill of till streamlined beneath ice. A moraine is glacial debris deposited at the margin or base without that streamlined form. An esker is a sinuous ridge of meltwater-laid sediment. A roche moutonnée is an erosional bedrock form with the opposite asymmetry.
Hindi Meaning
ड्रमलिन (dramlin), used as a loanword; हिमोढ़ टीला descriptively.
Common Questions
- What is a drumlin?
- A smooth elongated hill of glacial till moulded beneath moving ice and aligned with the direction of ice flow.
- Why are drumlins useful to geographers?
- Their asymmetric shape and alignment record the direction in which the ice was moving, so drumlin fields help reconstruct former glaciers.
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