Why is there a variation in the colour of crude oil?
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there is a variation depending on the way it's made, heat produced, time etc and mainly the dust particles suspended into it.
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Crude oil is the liquid component of petroleum and it varies drastically in its composition. Although the specific amounts of different hydrocarbons varies, it is always composed of a series of different hydrocarbons. Generally crude oil is about 85% carbon by weight, and most of the rest is hydrogen. Within crude oil there are also significant quantities of sulfur, oxygen, and nitrogen.
Crude oil was formed hundreds of millions of years ago in ancient oceans. In these oceans, dead organic matter fell to the ocean floor and was mixed with inorganic material. After much time passed, bacteria decomposed the organic material in the absence of oxygen and the temperature of the material increased with the increased pressure on it from sediment above. As pressure and temperature increased, the organic material slowly turned into crude oil and natural gas.
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