Q. Consider the following:
1. Pyroclastic debris
2. Ash and dust
3. Nitrogen compounds
4. Sulphur compounds
How many of the above are products of volcanic eruptions?
(a) Only one
(b) Only two
(c) Only three
(d) All four
Correct answer: (d) All four
Question from UPSC Prelims 2024 GS Paper
Explanation :
Products of Volcanic Eruptions
1. Pyroclastic debris
– This is definitely a volcanic product
– Consists of rock fragments, ash, and hot gases ejected during eruptions
2. Ash and dust
– Also a primary volcanic product
– Created when magma is explosively fragmented during eruptions
3. Nitrogen compounds
– Volcanoes do emit nitrogen compounds
– Mainly in the form of N2 and NOx compounds
4. Sulphur compounds
– Major volcanic emission
– Includes SO2 (sulfur dioxide) and H2S (hydrogen sulfide)
Answer: (d) All four