Petroleum is called mineral oil. It is an inflammable mixture of oily hydrocarbons. Like coal, petroleum is also a fossil fuel. It is generally taken that the oil has been derived from buried marine organisms. In areas where the sedimentary strata have been folded, most of the oil comes from anticlines rather than synclines.
Andros island in the Bahamas has the largest collection of the blue holes. Andros is the largest island in the Bahamas and it more than 200 Blue Holes. Blue Holes are usually sink holes or underwater caves in shape of a circle.
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