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UPSC 2001: Consider the following statements: I. Most magmas are a combination of liquid, solid and gas. II. Water vapour and carbon dioxide are the principal gases dissolved in a magma. III. Basaltic magma is hotter than the silicic magma. Which of these statements are correct?
(a)I only
(b)I and II
(c)II and III
(d)I, II and III
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Not attemptedCorrect Answer: (d) I, II and III
Magmas usually consist of a molten phase with suspended crystals and dissolved gases (I). The dominant dissolved gases are water vapour followed by carbon dioxide (II). Basaltic magmas erupt at higher temperatures (~1100–1250 °C) than silica-rich (rhyolitic) magmas (~800–1000 °C) (III). Therefore all three statements are correct (option d). ([usgs.gov](https://www.usgs.gov/observatories/calvo/news/how-hot-hot-when-it-comes-volcanoes?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2001 Geography question?▼
The correct answer is option (d): I, II and III. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physical Geography & Geomorphology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2001, GS Paper 1, as Question 55. It falls under Geography > Physical Geography & Geomorphology.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Physical Geography & Geomorphology?▼
UPSC has asked 25 questions from Physical Geography & Geomorphology (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.