We are not quite certain exactly how oil was formed. We know that over a period of millions of years, many changes took place on and under our earth's surface. Once much of the earth's surface which is now dry land was covered by seas The bodies of billions of tiny sea creatures settled to the sea bottoms and became mixed with the sand, clay and other matters carried into the seas by rivers. Somehow, under centuries of sunlight that fell upon the seas, and the pressures of earth forces, that mixture was transformed into gas and petroleum.
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