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The figure shows the underground deposits of petroleum and natural gas trapped between rock layers.  From bottom to top, the order of the trapped layers is:
AWater, natural gas, petroleum oil
BPetroleum oil, water, natural gas
CWater, petroleum oil, natural gas
DNatural gas, petroleum oil, water
Answer & Solution
Correct answer: C. Water, petroleum oil, natural gas
Oil and natural gas are both less dense than water and do not mix with it, so they float above the water layer. Among the two, natural gas (least dense) sits at the very top, with petroleum oil between water and gas. So: water at bottom, oil in the middle, gas at the top.
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