Q. Consider the following statements:
1.     The Oceanic crust is thicker than the Continental crust.
2.     Asthenosphere is located in Mantle.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: B
Notes:

Explanation: The Crust is the outermost solid part of the earth. It is brittle in nature. The thickness of the crust varies under the oceanic and continental areas.

  • Oceanic crust is thinner as compared to the continental crust. The mean thickness of oceanic crust is 5 km whereas that of the continental is around 30 km.
  • The continental crust is thicker in the areas of major mountain systems. It is as much as 70 km thick in the Himalayan region.
  • 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.

Source: NCERT – Fundamental of Physical Geography

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