BharatNotes Subduction
nounUsage in a UPSC answer
Just as the slow subduction of one tectonic plate beneath another stores immense strain that is eventually released as a catastrophic earthquake, the steady erosion of institutional accountability builds latent pressures within the polity that, if left unaddressed, can rupture into systemic crisis.
Synonyms
Antonyms
Word Family
subduct (v), subducted (adj), subducting (v pres.p), subduction (n), subduction-zone (n compound)
Root
Latin sub- = under + ducere = to lead, draw; subductio = a drawing under; tectonics term from 1960s
Etymology
From Latin sub ("under") + ducere ("to lead, to draw"); literally "to draw under" — the term was adopted in plate tectonics in the 1960s to describe the fate of oceanic lithosphere at destructive plate margins.
Memory Hook
SUB ("under") + DUCT ("to lead/carry", as in "aqueduct") = one plate is led UNDER another, ducking down into the mantle.
How This Word Works in UPSC Writing
The process by which one lithospheric plate descends beneath another at a convergent margin. It is the single most productive concept in GS1 physical geography because so much follows from it: deep ocean trenches, volcanic arcs, the deepest earthquakes and the recycling of crust back into the mantle. The rule to state is that the denser plate subducts, which is why oceanic lithosphere descends beneath continental.
Don’t Confuse It With
Subduction is one plate descending beneath another at a convergent margin. Obduction is the rarer reverse case where oceanic crust is thrust onto a continent. Seafloor spreading creates new crust at divergent margins. Collision occurs where two continental plates meet and neither subducts readily, producing mountain belts such as the Himalaya.
Hindi Meaning
क्षेपण (kshepan) or प्रविष्ठन (pravishthan).
Common Questions
- What is subduction?
- The process by which one tectonic plate descends beneath another at a convergent boundary and is recycled into the mantle.
- Which plate subducts when two plates converge?
- The denser one, which is why oceanic lithosphere typically descends beneath the lighter continental lithosphere.
Seen in UPSC Question Papers
- Prelims 2016 — Disaster Management
Real UPSC previous-year questions whose text uses “Subduction” — proof this word earns its place on your list.
Tip: press Alt+S to hear pronunciation
