Question

Exercises<br />Answer the following questions briefly<br />1. What do you mean by the crust of the Earth?<br />2. Why is the Lithosphere also known as the "Mineral Skin?<br />3. Describe the interior structure of the earth<br />4. What forms the basis of Wegener's Continental Drift Theory?<br />5. Why is the composition of the crustal layer of earth of great interest?<br />6. What is the Mohorovicic Discontinuity?<br />7. State the composition of the Sial layer.<br />8. What does the Sima layer consist of? Where is it located?<br />2. Distinguish between the Sima and Sal layer.<br />10. Which are the two most abundant chemical elements in the Earth's crust?<br />11. Describe the mantle of the Earth.<br />12. State the properties of the core of the Earth<br />​

Answer 1

• “Crust” describes the outermost shell of a terrestrial planet. Earth's crust is generally divided into older, thicker continental crust and younger, denser oceanic crust . Earth has three layers: the crust, the mantle, and the core. The crust is made of solid rocks and minerals.
• Lithosphere is also known as the 'Mineral Skin' because it is the layer of the uppermost crust of the Earth composed of rocks and minerals.
• The internal structure of Earth is layered in spherical shells: an outer silicate solid crust, a highly viscous asthenosphere and mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core.
• Alfred Wegener first presented his hypothesis to the German Geological Society on 6 January 1912. His hypothesis was that the continents had once formed a single landmass, called Pangaea, before breaking apart and drifting to their present locations.
• The internal structure of the Earth is layered in spherical shells: an outer silicate solid crust, a highly viscous asthenosphere and mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core . The force exerted by Earth's gravity can be used to calculate its mass .