ESS
Grade-7
Easy
Question
Assertion (A): Volcanic activity and plate margins are inextricably linked.
Reason (R): The convergent plate margins are home to the vast majority of the world's volcanoes.
- Both (A) and (R) are true and (R) is the correct explanation of (A)
- Both (A) and (R) are true, but (R) is not a correct explanation of (A)
- (A) is true, but (R) is false
- (A) is false, but (R) is true
Hint:
Both (A) and (R) are true and (R) is the correct explanation of (A)
The correct answer is: Both (A) and (R) are true and (R) is the correct explanation of (A)
As with earthquakes, volcanic activity is linked to plate tectonic processes. Most of the world's active above-sea volcanoes are located near convergent plate boundaries where subduction is occurring.
Plates rip apart at a divergent plate boundary, causing volcanic activity and shallow earthquakes; but at a convergent plate boundary, one plate dives or beneath the other, resulting in a variety of earthquakes and a line of volcanoes on the overriding plate.
Hence, both assertion and reason are correct.
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ESS
Match the following.
| A. Transform plate boundary |  |
| B. Convergent plate boundary |  |
| C. Divergent plate boundary |  |
Match the following.
| A. Transform plate boundary | |
| B. Convergent plate boundary | |
| C. Divergent plate boundary | |
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Reason (R): Earthquakes are generated by seismic activity, whereas volcanoes do not need seismic activity.
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- Seismograph informs about earthquake and other ground noises.
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What can you infer about the above terms?
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