Lithosphere

noun

/ˈlɪθəsfɪə/

The rigid outermost shell of the Earth, comprising the crust and the uppermost part of the mantle, which is broken into tectonic plates that float on the semi-fluid asthenosphere below.

✍️ Usage in a UPSC answer

Any credible disaster-management framework must recognise that the lithosphere is not an inert foundation but a dynamic, plate-bounded system, which is why the seismically vulnerable Himalayan belt demands earthquake-resilient building codes rather than reactive relief alone.

Synonyms

crustgeosphereEarth's crustrocky shellrock layertectonic shell

Antonyms

hydrosphereatmospherebiosphere

🌱 Word Family

lithospheric (adj), lithology (n), lithic (adj), monolith (n), megalith (n)

🔡 Root

Greek lithos = stone + sphaira = sphere, globe; coined 1880s, earliest recorded use 1887

📜 Etymology

From Greek lithos ("stone") + sphaira ("sphere, globe"); coined in the 1880s, with the earliest recorded usage in 1887.

🧠 Memory Hook

"Litho" = stone (as in lithography, monolith) + "sphere" = ball: picture a giant stone ball — the Earth's hard rocky outer shell.

🌍 Geography 📖 Seen in: World Geography

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