Discussion
The core mantle boundary occur at the depths of :
Answer: C
The core-mantle boundary lies at a depth of about 2900 km.
The boundary, also called the Gutenberg discontinuity, is at about 2,890 km. There P-wave velocity drops sharply and S-waves disappear, because the outer core below it is liquid. This is what produces the S-wave shadow zone beyond about 103° from an earthquake.
About 5,150 km is the depth of the inner core boundary, so 5500 km falls within the inner core region. 3900 km lies inside the outer core, and 1200 km is within the lower mantle.
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