Examine these two statements carefully and select the answers to these items using the code given below: Statement I: Volcanic eruption is accompanied by earthquakes. Statement II: Volcanoes erupt water vapours and dust particles in the atmosphere.

Examine these two statements carefully and select the answers to these items using the code given below: Statement I: Volcanic eruption is accompanied by earthquakes. Statement II: Volcanoes erupt water vapours and dust particles in the atmosphere. Correct Answer Both the Statements are individually true but Statement II is not the correct explanation of Statement I.

The correct answer is option 2 i.e. Both the Statements are individually true but Statement II is not the correct explanation of Statement I.

Volcano

• A volcano is an opening in the earth’s crust through which gases, molten rocks lava, ash, steam etc. are emitted outward in the course of an eruption. 
• Such vents or openings occur in those parts of the earth’s crust where the rock strata are relatively weak.
• Volcanic activity is closely connected with crystal disturbances, particularly where there are zone weakness due to deep faulting or mountain folding.
• Major earthquakes usually caused by movement along faults.
• This is because the molten magma float over the asthenosphere that forces its way into the planes of weakness of the crust to escape.
• Hence both the statements are individually true but Statement II is not the correct explanation of Statement I.
• There are three types of volcanoes i.e. active, dormant and extinct.
• When volcanoes frequently errupted or errupted within recent time are said to be active.
• Those shows the signs of possible erruption in the future are said to be dormant.
• Volcanoes that have not errupted at all in historic times but retain the features of volcanoes are termed as extinct.