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(as-then-o-sphere) 4 syllables

Definition

noun. the layer of the Earth's mantle that is partially molten and allows tectonic plates to move.

Example Sentence

The asthenosphere is estimated as being from 50 to several hundred miles thick.

More Example Sentences

Earthquakes occur due to movement in the asthenosphere.

Synonyms

mantle; layer; zone

Antonyms

inner core

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asthenosphere
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