Subduction

noun

/səbˈdʌkʃən/

The geological process in which one tectonic plate slides beneath another at a convergent plate boundary, descending into the mantle where it is recycled — creating deep ocean trenches, volcanic arcs, and some of the world's most powerful earthquakes.

✍️ Usage 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

underthrustingsubmergencedescentsinkingundersliding

Antonyms

obductionupliftemergenceupthrust

🌱 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.

📝 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.

🌍 Geography 📖 Seen in: Plate Tectonics & Volcanism — Continen...

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