- Movement of tectonic plates: When Earth’s plates collide, slide past, or move away from each other, stress builds up and is released suddenly as an earthquake.
- Volcanic activity: Eruptions can cause earthquakes when magma forces its way through cracks in the crust, creating tremors around the volcano.
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प्रश्न
State two natural causes of an earthquake.
लघु उत्तरीय
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उत्तर
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Earthquake and its causes
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अध्याय 8: Earthquakes - EXERCISES [पृष्ठ ७९]
APPEARS IN
संबंधित प्रश्न
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:
About 70 percent of the earthquakes occur in the _________________ Belt.
Name two man-made 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?
How is the intensity of an earthquake measured?
Describe the world’s distribution of earthquakes.
Name some Earthquakes which caused great damage.
Describe the main type of Earthquake Waves.
Name three causes of Earthquakes.
Give two major causes of earthquakes.
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.
An earthquake of magnitude ______ scale can cause damage from things falling.
