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प्रश्न
Answer the following:
A volcanic eruption is one of the main causes of earthquakes.
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उत्तर
A volcanic eruption is one of the main causes of earthquakes because volcanic earthquakes are caused by gas explosions. Such earthquakes occur either simultaneously with eruption or more commonly in the period preceding an eruption.
संबंधित प्रश्न
For the formation of a rift valley, which of the following processes should occur in the earth’s crust?
Give a geographical reason.
Buildings collapsed at the foothills of the Himalayas because of an earthquake. Before collapsing, they were moving forward and backward.
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 _________.
What are known as seismic focus and epicenter with respect to an earthquake?
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. |
Describe how earthquakes are caused on the surface of the earth.
What is the difference between seismic focus and epicenter?
Describe the main type of Earthquake Waves.
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 ______.
On an outline map of the world, mark the Pacific Ring of Fire
How the earthquake can be recorded?
Name the point where the vibrations originate in an earthquake.
