Consider the following statements: 1. The discontinuity between the crust and the hydrosphere is known as the Conrad Discontinuity. 2. Crust is the outermost liquid part of the earth, normally about 1-20 kms thick. 3. The core is separated from the mantle by Guttenberg’s Discontinuity. 4. The discontinuity between the upper mantle and the lower mantle is known as Repetti Discontinuity. Which of the statements given above is/ are correct?  

Consider the following statements: 1. The discontinuity between the crust and the hydrosphere is known as the Conrad Discontinuity. 2. Crust is the outermost liquid part of the earth, normally about 1-20 kms thick. 3. The core is separated from the mantle by Guttenberg’s Discontinuity. 4. The discontinuity between the upper mantle and the lower mantle is known as Repetti Discontinuity. Which of the statements given above is/ are correct?   Correct Answer 1, 3 and 4 only

The correct answer is 1, 3 and 4

​/hint - 

• The interior of the earth can be understood only by indirect evidences as neither anyone has nor anyone can reach the interior of the earth.

/imp

• The outermost stable portion of the earth, typically around 8-40 kms deep, is the crust. In nature, it is brittle. The crust is made up of nearly 1 percent of the volume of the earth and 0.5 percent of the earth's density.
• There are distinct thicknesses of the crust beneath the oceanic and continental regions. As compared to the continental crust, the oceanic crust is thinner.
• The core-mantle boundary is located at the depth of 2900 km. The outer core is in a liquid state while the inner core is in the solid-state. 

/key

• Generally, the interior of the Earth is split into three main layers: the crust, the mantle, and the core. The rough, brittle crust extends to the so-called Mohorovicic discontinuity, dubbed the Moho, from the earth's surface.
• The Moho is not positioned at a uniform depth, but some 10 kilometres below the seafloor and some 35 kilometres below the continent's surface.