By signing in you confirm you are 18 or older, or have your parent’s or guardian’s consent.

NDA 1 2024 GAT, question 115

Topic: Geography

Q115

Which of the following statements regarding Earth's internal structure is/are correct ?

  1. The oceanic crust is heavier than the continental crust.

  2. Most of the Earth's internal heat is contained within the mantle.

  3. Large convective cells in the crust circulate heat and drive plate-tectonic processes.

Select the answer using the code given below :

  1. (a) 3 only
  2. (b) 1 and 2 onlyCorrect answer
  3. (c) 2 and 3 only
  4. (d) 1, 2 and 3

Solution.

Answer: (b) 1 and 2 only

  1. Statement 1 is correct: oceanic crust is denser (heavier) than continental crust.
  2. Statement 2 is correct: the mantle, with its huge volume, holds most of the Earth's internal heat.
  3. Statement 3 is wrong: the convection that moves plates happens in the mantle, not in the rigid crust.