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Consider the following passage: These volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and gives a distinct appearance. Which of the following types of volcano is described in the above passage?
- a)Shield Volcano
- b)Composite Volcano
- c)Calderas
- d)Flood basalt Volcano
Correct answer is option 'B'. Can you explain this answer?
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Consider the following passage: These volcanoes are characterized by e...
- A volcano is a place where gases, ashes and/or molten rock material – lava – escape to the ground. A volcano is called an active volcano if the materials mentioned are being released or have been released out in the recent past.
- The layer below the solid crust is mantle. It has higher density than that of the crust. The mantle contains a weaker zone called asthenosphere. It is from this that the molten rock materials find their way to the surface.
- Volcanoes are classified on the basis of nature of eruption and the form developed at the surface. Major types of volcanoes are as follows
- Shield Volcanoes
- Barring the basalt flows, the shield volcanoes are the largest of all the volcanoes on the earth. The Hawaiian volcanoes are the most famous examples. These volcanoes are mostly made up of basalt, a type of lava that is very fluid when erupted.
- For this reason, these volcanoes are not steep. They become explosive if somehow water gets into the vent; otherwise, they are characterised by low-explosivity. The upcoming lava moves in the form of a fountain and throws out the cone at the top of the vent and develops into cinder cone.
- Shield Volcanoes
- Composite Volcanoes
- These volcanoes are characterised by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and this makes the mounts appear as composite volcanoes.
- Composite volcanoes, also known as stratovolcanoes, are tall, steep-sided volcanoes formed from alternating layers of lava flows, ash, and other volcanic debris. They are characterized by their distinctive conical shape and their explosive eruptions.
- Some of the features of composite volcanoes are
- Steep-sided cone shape: Composite volcanoes have a tall, conical shape, with steep sides that can reach up to 30 degrees.
- Crater: At the summit of the volcano, there is often a bowl-shaped depression called a crater. This is the vent through which lava, ash, and other volcanic materials are ejected during an eruption.
- Lava flow: Composite volcanoes are typically composed of both explosive eruptions and effusive eruptions, which produce lava flows. The lava flows from these volcanoes can be quite thick and viscous, meaning that they don't travel very far from the vent.
- Lahars: Composite volcanoes are prone to producing lahars, which are fast-moving mudflows that are triggered by volcanic activity. Lahars can be highly destructive, as they can carry large boulders, trees, and other debris, and can travel many kilometers from the volcano.
- Caldera
- These are the most explosive of the earth’s volcanoes. They are usually so explosive that when they erupt they tend to collapse on themselves rather than building any tall structure. The collapsed depressions are called calderas. Their explosiveness indicates that the magma chamber supplying the lava is not only huge but is also in close vicinity.
- Flood Basalt
- Provinces These volcanoes outpour highly fluid lava that flows for long distances. Some parts of the world are covered by thousands of sq. km of thick basalt lava flows. There can be a series of flows with some flows attaining thickness of more than 50 m. Individual flows may extend for hundreds of km.
- The Deccan Traps from India, presently covering most of the Maharashtra plateau, are a much larger flood basalt province. It is believed that initially the trap formations covered a much larger area than the present. o Mid-Ocean Ridge Volcanoes
- These volcanoes occur in the oceanic areas. There is a system of mid-ocean ridges more than 70,000 km long that stretches through all the ocean basins. The central portion of this ridge experiences frequent eruptions.
- Hence option (b) is the correct answer.
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Consider the following passage: These volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and gives a distinct appearance. Which of the following types of volcano is described in the above passage?a)Shield Volcanob)Composite Volcanoc)Calderasd)Flood basalt VolcanoCorrect answer is option 'B'. Can you explain this answer?
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Consider the following passage: These volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and gives a distinct appearance. Which of the following types of volcano is described in the above passage?a)Shield Volcanob)Composite Volcanoc)Calderasd)Flood basalt VolcanoCorrect answer is option 'B'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following passage: These volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and gives a distinct appearance. Which of the following types of volcano is described in the above passage?a)Shield Volcanob)Composite Volcanoc)Calderasd)Flood basalt VolcanoCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following passage: These volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and gives a distinct appearance. Which of the following types of volcano is described in the above passage?a)Shield Volcanob)Composite Volcanoc)Calderasd)Flood basalt VolcanoCorrect answer is option 'B'. Can you explain this answer?.
Consider the following passage: These volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and gives a distinct appearance. Which of the following types of volcano is described in the above passage?a)Shield Volcanob)Composite Volcanoc)Calderasd)Flood basalt VolcanoCorrect answer is option 'B'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following passage: These volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and gives a distinct appearance. Which of the following types of volcano is described in the above passage?a)Shield Volcanob)Composite Volcanoc)Calderasd)Flood basalt VolcanoCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following passage: These volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and gives a distinct appearance. Which of the following types of volcano is described in the above passage?a)Shield Volcanob)Composite Volcanoc)Calderasd)Flood basalt VolcanoCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Consider the following passage: These volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and gives a distinct appearance. Which of the following types of volcano is described in the above passage?a)Shield Volcanob)Composite Volcanoc)Calderasd)Flood basalt VolcanoCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for UPSC.
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ample number of questions to practice Consider the following passage: These volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions. Along with lava, large quantities of pyroclastic material and ashes find their way to the ground. This material accumulates in the vicinity of the vent openings leading to formation of layers, and gives a distinct appearance. Which of the following types of volcano is described in the above passage?a)Shield Volcanob)Composite Volcanoc)Calderasd)Flood basalt VolcanoCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice UPSC tests.
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