how was petroleum formed?
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when dead marine organisms settled at the bottom of sea and gradually got covered undered layers of sand. after millioms of years under high temperature and pressure these organisms got converted into petroleum and natural gas......
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Millions of years ago, sea covered much of what is now dry land. In prehistoric times, tiny plants and animals lived in the sea. When these died, they sank to the bottom of the sea and got buried in the layers of mud and sand. as the ages passed, this organic material sank deeper and deeper. Due to the intense pressure of Earth's crust, these energy containing substances changed into oil.
Oil being light and mobile, moved upwards through the rocks but eventually got trapped beneath impermeable rocks in the Earth's crust and that is where present oil reserves are located. Petroleum is extracted from such reserves.
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