UPSC Express

Consider the following statements related to the internal structure of the Earth:
1. Mohorovicic discontinuity is the boundary between lower crust and upper mantle.
2. Lehman discontinuity lies between outer core and inner core.
3. Gutenberg discontinuity separates lower mantle and outer core.
Which of the statement(s) given above is/are correct?
A.
1 and 2
B.
1 only
C.
2 and 3
D.
1, 2 and 3
Explanation :
The Mohorovicic Discontinuity, or “Moho,” is the boundary between the crust and the mantle. At this discontinuity, seismic waves accelerate. The Mohorovicic Discontinuity marks the lower limit of Earth’s crust. It is identified by sudden change in the density of the layer. A solid inner core surrounded by a liquid outer core is separated by what has come to be called the Lehmann Discontinuity. The Gutenberg discontinuity in the Earth’s interior separates lower mantle and the outer core