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Which option correctly states the role of asthenosphere?

Answer and explanation

Correct answer: It provides a soft, semi-fluid base for the movement of lithospheric plates

The asthenosphere is a relatively weak, hot and semi-fluid zone in the upper mantle below the rigid lithosphere. Its plastic nature helps lithospheric plates move slowly, so option A is correct. Option B describes the inner core, whereas the asthenosphere is not located at Earth’s centre. Exam tip: remember the asthenosphere as the weak layer beneath the plates.

Related tags

AsthenosphereUpper MantleLithospherePlate TectonicsEarth InteriorInterior Structure Of The EarthInterior Of The EarthGeography

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