Class 7 > Social Studies (SST) Class 7 > Inside Our Earth (Overview)
Inside Our Earth (Overview) Video Lecture - Social Studies (SST) Class 7
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FAQs on Inside Our Earth (Overview) Video Lecture - Social Studies (SST) Class 7
| 1. What is the composition of Earth's interior? |  |
Ans. Earth's interior is composed of several layers. The outermost layer is the crust, which is made up of solid rocks and minerals. Beneath the crust is the mantle, which is mostly solid but has some portions that are semi-fluid. The innermost layer is the core, which is primarily made of iron and nickel.
| 2. How do scientists study the Earth's interior? | |
Ans. Scientists study the Earth's interior using various methods. One common method is seismology, which involves analyzing the seismic waves produced by earthquakes. By studying the behavior of these waves as they pass through different layers of the Earth, scientists can infer information about its composition and structure. Other methods include analyzing rock samples from deep drilling and studying volcanic eruptions.
| 3. What is the role of convection currents in Earth's interior? | |
Ans. Convection currents play a crucial role in Earth's interior. In the mantle, heat from the Earth's core causes the rock to become less dense and rise towards the surface. As it cools, it becomes denser and sinks back down. This continuous movement of rock creates convection currents, which transfer heat in the mantle and help drive plate tectonics, leading to the movement of Earth's lithospheric plates.
| 4. How does the Earth's interior contribute to the formation of volcanoes and earthquakes? | |
Ans. The Earth's interior plays a significant role in the formation of volcanoes and earthquakes. Volcanoes are formed when molten rock, called magma, rises to the surface through cracks in the Earth's crust. This magma is generated by the melting of rocks in the mantle. Earthquakes occur when there is a sudden release of energy in the Earth's crust, which is often caused by the movement of tectonic plates along faults. The movement of these plates is driven by the convection currents in the Earth's interior.
| 5. How does the Earth's interior affect the magnetic field? | |
Ans. The Earth's interior, specifically the outer core, is responsible for generating the planet's magnetic field. The outer core is made up of molten iron and nickel, which are in constant motion due to the convection currents. This motion generates electric currents, which in turn create a magnetic field. This magnetic field extends around the Earth and protects it from harmful solar radiation, and also plays a crucial role in navigation and migration of certain animals.
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