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Quick Revision: Inside Our Earth Video Lecture | Social Studies (SST) Class 7 (Old NCERT)
FAQs on Quick Revision: Inside Our Earth Video Lecture - Social Studies (SST) Class 7 (Old NCERT)
| 1. What is the composition of the Earth's interior? |  |
Ans. The Earth's interior is composed of three main layers: the crust, the mantle, and the core. The crust is the outermost layer and is made up of solid rock. The mantle is the middle layer and consists of semi-solid rock. The core is the innermost layer and is primarily composed of iron and nickel.
| 2. How do scientists study the Earth's interior? | |
Ans. Scientists study the Earth's interior through various methods, including seismic waves, drilling, and studying volcanic eruptions. Seismic waves, generated by earthquakes or human-made sources, provide valuable information about the Earth's internal structure. By analyzing the speed, direction, and reflection of these waves, scientists can infer the composition and density of different layers.
| 3. What causes tectonic plates to move? | |
Ans. Tectonic plates move due to the process of plate tectonics. The Earth's lithosphere is divided into several large and small plates that float on the semi-fluid asthenosphere beneath them. The movement of these plates is driven by convection currents in the asthenosphere. Heat from the Earth's core creates these currents, causing the plates to slowly move and interact with each other.
| 4. How does the Earth's interior affect the surface features? | |
Ans. The Earth's interior plays a significant role in shaping the surface features. The movement of tectonic plates, driven by the convective currents in the mantle, leads to various geological phenomena such as earthquakes, volcanic eruptions, and the formation of mountains. The composition and density of the Earth's layers also influence the behavior of these surface features.
| 5. What is the significance of studying the Earth's interior? | |
Ans. Studying the Earth's interior is crucial for understanding the planet's geological processes, predicting natural disasters, and exploring its resources. It helps scientists understand the formation and evolution of the Earth, including the distribution of continents and oceans, the occurrence of earthquakes and volcanic eruptions, and the development of natural resources such as minerals, oil, and gas. This knowledge is valuable for both scientific research and practical applications.
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Video Description: Quick Revision: Inside Our Earth for Class 7 2025 is part of Social Studies (SST) Class 7 (Old NCERT) preparation.
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