Question

Which of the following statements are correct?

1. The Conrad Discontinuity separates the continental crust from the oceanic crust.

2. The Moho Discontinuity lies between the crust and the mantle.

3. The Repetti Discontinuity separates the upper and lower mantle.

• A. 1 & 2
• B. 2 & 3
• C. 1 & 3
• D. All are correct

Answer 1

Answer:

B. 2 & 3

• Correct Answer: Option B) 2 & 3

• Statement 1: The Conrad Discontinuity separates the continental crust from the oceanic crust. This statement is incorrect. The Conrad Discontinuity is found within the continental crust itself, separating the upper granitic layer from the lower basaltic layer. It does not separate continental crust from oceanic crust.

• Statement 2: The Moho Discontinuity lies between the crust and the mantle. This statement is correct. The Mohorovičić Discontinuity (commonly called the Moho) is the boundary between Earth's crust and the underlying mantle. It was discovered by Croatian seismologist Andrija Mohorovičić in 1909.

• Statement 3: The Repetti Discontinuity separates the upper and lower mantle. This statement is correct. The Repetti Discontinuity is located at a depth of approximately 700 km and marks the boundary between the upper mantle and the lower mantle.