Q. Consider the following pairs:
Discontinuity :Layers
1. Moho Discontinuity:Separates Crust and mantle
2. Gutenberg Discontinuity:Separates mantle and core
3. Connardo Discontinuity:Separates Felsic and Mefic layer
Which of the above given pairs is/are correctly matched?

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: D
Notes:

The portion of the interior beyond the crust is called the mantle. The mantle extends from Moho’s discontinuity to a depth of 2,900 km. The upper portion of the mantle is called asthenosphere.  

  • Connardo’s discontinuity separates upper felsic layer of continent from mefic layer. It is only present within continental crust and not in the oceanic layer. 
  • While the Gutenberg discontinuity separates the lower mantle from the core. It is present at about 2900 km of depth. 

Source: NCERT – XI Fundamentals of Physical Geography