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प्रश्न
How are earthquakes useful?
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उत्तर
Earthquakes cause energy release to put the earth in good shape; several landforms are uplifted to build large plains, e.g., Sagami Bay uplifted 200 m, and landslides cause the formation of lakes in the Himalayan region.
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संबंधित प्रश्न
Identify and name the internal movement.
Molten magma is thrown out of the earth’s mantle.
Arrange the following statements in chronological order in which an earthquake occurs.
- The earth’s surface vibrates.
- The plates suddenly move.
- Due to the movements in the mantle, compression goes on increasing.
- Along the weak points ( faultlines) rocks break apart.
- Stored energy is released in the form of seismic waves.
Fill in the blank:
Most earthquakes occur on account of the strain in the _________.
Fill in the blank:
The last of the earthquake waves to arrive on the surface of the earth are ___________ waves.
Match the Columns.
| Column A | Column B |
| 1. Tsunami | (a) The waves that make the inhabitants feel the ground motion. |
| 2. Seismograph | (b) The instrument for measuring the intensity of earthquakes. |
| 3. S-waves | (c) Harbour waves generated by oceanic earthquakes. |
| 4. Richter scale | (d) The point on the earth surface directly above the seismic focus. |
| 5. Epicentre | (e) An instrument for recording the movement of earthquake waves. |
Explain the three types of earthquake waves.
What is the difference between seismic focus and epicenter?
Is it possible to predict an earthquake? Give reasons to support your answer.
Describe the world’s distribution of earthquakes.
What was the cause of the Koyna earthquake in India?
Why are earthquakes related to volcanoes?
Give two major causes of earthquakes.
Give one word for the following :
The surface position immediately above the origin of an earthquake.
Give reasons for the following:
Internal processes are different from external processes.
Seismology is the study of ______.
Choose the odd one
The earthquake is measured by the ______ scale.
An earthquake of magnitude ______ scale can cause damage from things falling.
What is the point of the earth’s surface directly above the focus called?
