Question

Name the mantle-core interface where primary seismic waves slow down and secondary seismic waves disappear completely.

Options

• Gutenberg Discontinuity

• Mantlic Discontinuity

• Core Discontinuity

• Mohorovicic Discontinuity

Answer 1

Gutenberg Discontinuity

Explanation:

The Gutenberg Discontinuity is the boundary between the mantle and the core. At this depth, primary seismic waves (P-waves) slow down significantly, and secondary seismic waves (S-waves) disappear completely because the outer core is in a molten state. This discontinuity occurs at around 2900 km below the Earth's surface.