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Question
On an outline map of the world, mark the Pacific Ring of Fire
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Solution
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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.
Give reasons why an earthquake occurs.
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.
What is known as the Richter scale?
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.
Is it possible to predict an earthquake? Give reasons to support your answer.
How is the intensity of an earthquake measured?
Name three causes of Earthquakes.
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.
The magnitude of an earthquake is measured by ______.
The earthquake waves are recorded by an instrument known as ______.
Seismology is the study of ______.
Define Earthquake.
What is Seismograph?
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?
