Question

Q. With reference to the structure of the earth, ‘Moho’ discontinuity is the boundary between the Earth’s:

• A. Mantle and Core
• B. Crust and Core
• C. Crust and Mantle
• D. Oceanic crust and Continental crust

Answer 1

The correct option is C Crust and Mantle

Explanation:

The Moho is the boundary between the crust and the mantle in the earth. This is a depth where seismic waves change velocity and there is also a change in chemical composition. Also termed the Mohorovicic' discontinuity' after the Croatian seismologist Andrija Mohorovicic' (1857-1936) who discovered it.

• The boundary is between 25 and 60 km deep beneath the continents and between 5 and 8 km deep beneath the ocean floor. Hence option (c) is correct.