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Interior of Earth Video Lecture | Geography for UPSC CSE
FAQs on Interior of Earth Video Lecture - Geography for UPSC CSE
| 1. What are the main layers of the Earth's interior? |  |
Ans. The Earth's interior is primarily divided into four main layers: the crust, mantle, outer core, and inner core. The crust is the thin outer layer where we live. Beneath the crust is the mantle, which is semi-solid and extends to about 2,900 kilometers deep. The outer core is liquid and composed mainly of iron and nickel, while the inner core is solid and also made primarily of iron and nickel, with temperatures similar to the surface of the sun.
| 2. How do scientists study the Earth's interior? | |
Ans. Scientists study the Earth's interior using various methods, including seismic wave analysis, magnetic field studies, and gravitational measurements. When earthquakes occur, they produce seismic waves that travel through the Earth. By analyzing the speed and path of these waves, scientists can infer the properties and structure of the Earth's layers.
| 3. What is the composition of the Earth's inner core? | |
Ans. The Earth's inner core is primarily composed of iron and nickel, along with some lighter elements such as sulfur and oxygen. It is believed to be about as hot as the surface of the sun, reaching temperatures around 5,000 to 7,000 degrees Celsius. The immense pressure at this depth keeps the inner core solid despite the high temperatures.
| 4. Why is the mantle considered semi-solid? | |
Ans. The mantle is considered semi-solid because, although it is composed of solid rock, it can flow slowly over geological time scales. This flow is due to the high temperatures and pressures within the mantle, which allow the rock to behave like a viscous fluid. This property enables the movement of tectonic plates on the Earth's surface.
| 5. What role does the outer core play in Earth's magnetic field? | |
Ans. The outer core plays a crucial role in generating the Earth's magnetic field through a process known as the geodynamo. As the liquid iron and nickel in the outer core moves, it creates electrical currents. These currents generate magnetic fields, which combine to form the overall magnetic field surrounding the Earth, protecting the planet from solar radiation and cosmic rays.
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