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With reference to the earthquakes, consider the following statements:
1. According to the theory of plate tectonics, the Earth’s crust and upper mantle are made of large rigid plates that can move relative to one another.
2. The point inside the Earth where the earthquake rupture starts is called epicentre.
Which of the statements given above is/are correct?
  • a)
    1 only
  • b)
    2 only
  • c)
    Both 1 and 2
  • d)
    Neither 1 nor 2
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
With reference to the earthquakes, consider the following statements:1...
's lithosphere is broken into several large plates.
2. The majority of earthquakes occur along plate boundaries.
3. Earthquakes can occur at any depth within the Earth.
4. The intensity of an earthquake is measured using the Richter scale.

Which of the statements are true?

The true statements are:
1. According to the theory of plate tectonics, the Earth's lithosphere is broken into several large plates.
2. The majority of earthquakes occur along plate boundaries.
3. Earthquakes can occur at any depth within the Earth.
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Community Answer
With reference to the earthquakes, consider the following statements:1...
Recently a powerful earthquake of magnitude 5.9 on the Richter scale struck a remote town in Afghanistan, killing over a thousand and injuring many more.
  • According to the theory of plate tectonics, the Earth’s crust and upper mantle are made of large rigid plates that can move relative to one another. Slip on faults near the plate boundaries can result in earthquakes.
  • The point inside the Earth where the earthquake rupture starts is called the focus or hypocentre. The point directly above it on the surface of the Earth is the epicentre.
What are seismic waves?
  • Any elastic material when subjected to stress, stretches in a proportional way, until the elastic limit is reached. When the elastic limit is crossed, it breaks.
  • Similarly, the Earth also has an elastic limit and when the stress is higher than this limit, it breaks. Then there is a generation of heat, and energy is released. Since the material is elastic, the energy is released in the form of elastic waves.
  • These propagate to a distance determined by the extent of the impact. These are known as seismic waves.
Hence only statement 1 is correct.
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With reference to the earthquakes, consider the following statements:1. According to the theory of plate tectonics, the Earth’s crust and upper mantle are made of large rigid plates that can move relative to one another.2. The point inside the Earth where the earthquake rupture starts is called epicentre.Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'A'. Can you explain this answer?
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