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Option 4 : None of the above.
The correct answer is option 4) i.e. None of the Above.
- The solid portion of the Earth is called the Lithosphere.
- The Earth is divided into 3 layers - The crust, The Mantle & The Core.
- The crust is the outermost layer of the earth and it is brittle in nature.
- The thickness of the crust varies under the oceanic and continental areas.
- Oceanic crust is thinner as compared to the continental crust.
- The mean thickness of the oceanic crust is 5 km whereas that of the continental is around 30 km.
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