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प्रश्न
Define Earthquake.
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उत्तर
A sudden movement of a portion of the earth’s crust which produces a shaking or trembling is known as an earthquake.
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संबंधित प्रश्न
For the formation of a rift valley, which of the following processes should occur in the earth’s crust?
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.
What is called an earthquake?
State two natural causes of an earthquake.
How are earthquakes useful?
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?
How are earthquakes distributed over the globe?
What is an Earthquake?
How an earthquake is caused?
Earthquakes occur in the Mid-Atlantic belt.
Give reasons for the following:
Internal processes are different from external processes.
Give reasons for the following:
Folding and faulting frequently go together.
The magnitude of an earthquake is measured by ______.
The earthquake waves are recorded by an instrument known as ______.
On an outline map of the world, mark the Pacific Ring of Fire
The earthquake is a ______ activity.
What is the point of the earth’s surface directly above the focus called?
