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In underground deposits, the petroleum and gas layer lies above water because oil and gas are:

AColder than water
BLighter than water
CHeavier than water
DMixed with water
Answer & Solution
Correct answer: B. Lighter than water
1. They also do not mix with water. 2. Being lighter, they float above. 3. So the oil layer sits on the water layer. _Source: syllabus Science, Chapter 5, Coal and Petroleum._
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