Why is the upper mantle called asthenosphere ?
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Q1)Why is the upper mantle called asthenosphere ?
A1)The asthenosphere is known to be for its weak layer in the upper mantle. The asthenosphere is made of solid rock, when given heat and pressure, the rocks flow like a liquid. ... The name asthenosphere is taken from Greek which means weak sphere.
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The upper mantle is called asthenosphere, “astheno” is a Greek word meaning 'weak'. It is called weak layer because it is in liquid state where rock material deforms more readily, and magma formation takes place.
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