EVERYDAY SCIENCE

Detailed explanation-1: -Detailed Solution. The correct answer is Earth’s silicate mantle and its liquid iron-nickel outer core. The Gutenberg discontinuity occurs within Earth’s interior at a depth of about 2, 900 km below the surface at the boundary between Earth’s mantle and outer core.

Detailed explanation-2: -The core is made of two layers: the outer core, which borders the mantle, and the inner core. The boundary separating these regions is called the Bullen discontinuity.

Detailed explanation-3: -The region which separates mantle and core is called Gutenberg discontinuity.

Detailed explanation-4: -The Gutenberg discontinuity occurs within Earth’s interior at a depth of about 2, 900 km (1, 800 mi) below the surface, where there is an abrupt change in the seismic waves (generated by earthquakes or explosions) that travel through Earth.

Detailed explanation-5: -She observed that the seismic waves reflect off the boundary of the inner core and can be detected by sensitive seismographs on the Earth’s surface. This boundary is known as the Bullen discontinuity, or sometimes as the Lehmann discontinuity.