Oil and Natural gases have formed from the remains of plants and sea creatures. they are the result of the action of heat and pressure on plant and animal remains over millions of years, in the absence of air. The crude oil we use today was formed millions of years ago but crude oil is still being formed today.
More crude oil is formed every time an animal or plant in the sea dies and is squashed by layers of other dead marine life (that turns into rock)over the top. This takes a long time. Oil and natural gas are carbon by-products and a common name for carbon by-products is petroleum. Oil is formed deep under the surface. Petroleum is formed from organic materials. This organic material comes from the remains of dead organisms. The organic material becomes a part of layers of sedimentary rocks. More layers form on the top of these layers and the organic material changes into petroleum, and is contained into a source rock. This causes the petroleum to turn into oil.
Answer
Adjacent seas were covered by shallow oceans. Over a period of millions of years the remains of marine animals and plants fell to the sea floor, they accumulated into thick layers and eventually were covered by layers of sand and silt. Over time, the immense weight of all of these layers compressed the lower layers into sedimentary rock. Bacterial actions, heat, and pressure converted the remains of the animals and plants into oil..... Oil is found under ground.
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