Which of the following pairs of 'Discontinuities in earth's interior - Zones of the eart' is correct? I. Repetti Discontinuity - Upper and lower mantle II. Moho Discontinuity - Upper and lower crust III. Guttenberg Discontinuity - Outer and inner core

Which of the following pairs of 'Discontinuities in earth's interior - Zones of the eart' is correct? I. Repetti Discontinuity - Upper and lower mantle II. Moho Discontinuity - Upper and lower crust III. Guttenberg Discontinuity - Outer and inner core Correct Answer Only I

The correct answer is Only I.

Key Points

• Discontinuities Inside the Earth - 
  • Conrad Discontinuity:  Transition zone between SIAL and SIMA layers of crust. Hence, pair 2 is incorrectly matched.
  • Mohorovicic Discontinuity:  Transition zone between the Crust and Mantle. Hence, pair 1 is correctly matched.
  • Repiti Discontinuity: Transition zone between Outer mantle and Inner mantle.
  • Gutenberg Discontinuity: Transition zone between Mantle and Core.
  • Lehman Discontinuity: Transition zone between Outer core and Inner core. Hence, pair 3 is correctly matched.

Important Points

• Layers of the earth - 
  • The Crust - It 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 continental crust.
  • The Mantle - 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 the asthenosphere.
  • The core - The core-mantle boundary is located at the depth of 2,900 km. The outer core is in a liquid state while the inner core is in a solid-state. The density of material at the mantle core boundary is around 5 g/cm3 and at the center of the earth at 6,300 km, the density value is around 13g/cm3. The core is made up of very heavy material mostly constituted by nickel and iron. It is sometimes.