It is called petroleum because it is found under the crust of Earth trapped in rocks. It occurs deep under the surface of Earth between two layer of impervious rocks. It is lighter than water, so it floats over water and so it is found above water.
Which is the layer of gas is found floating above the layer of petroleum?
Thus gases will float above oil which is floating above water. So we can say that the oil and gas floats above the water. Thus the layer containing petroleum oil and gas is above the water.
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Why is natural gas found above petroleum?
The petroleum is lighter than It water & hence, floats over it. Natural gas is found above petroleum, trapped between the rock cap & petroleum layer. … When the pressure of gas subsides, petroleum starts flowing out due to the pressure of natural gas.
Why is petroleum called black gold?
The Petroleum is called black gold because when the crude oil is extracted from the soil below, it is black in colour. … But after the purification of black crude oil, it gives golden colour.
How is petroleum made up?
Petroleum is a fossil fuel, meaning that it has been created by the decomposition of organic matter over millions of years. Petroleum is formed when large quantities of dead organisms–primarily zooplankton and algae–underneath sedimentary rock are subjected to intense heat and pressure.
What is difference between coal and petroleum?
Basically, these differences center around the fact that coal is found at its site of deposition as a solid and relatively pure massive organic substance, whereas petroleum is liquid and migrates readily from its place of origin into porous reservoir rocks. Kerogen is the main precursor material of petroleum compounds.