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What is the speed attained by the P-waves in the C-layer under the Continental crust?

(a) 6 to 7.6 km/sec

(b) 3 to 4 km/sec

(c) 5 to 6.3 km/sec

(d) 1.8 to 2.5 km/sec

I have been asked this question in semester exam.

My doubt is from The Crust in portion Internal Structure of the Earth of Engineering Geology

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The correct option is (a) 6 to 7.6 km/sec

The explanation: The C-layer is the lowermost layer of the continental crust and here the P-waves attain velocity as high as 6 to 7.6 km/sec.

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