Hello steeminians friends following with this incredible #celestialchallenge initiative, here we are leaving our contribution on Monday referring to the darkness, we thank the steeminians 
Sunday-light
Monday-darkness
Tuesday-animalkingdom
Wednesday-Structures
Thursday-ForcesNature
Friday-loveBeautyFreedom
Saturday-Agriculture
In view of this today I decided to talk about black gold, that is to say oil, vital material for my country and its development at present. The oil is a mixture of organic compounds mainly hydrocarbons insoluble in water, is produced in the interior of the earth and until now has not defined what is the process of its formation. Its extraction is by drilling wells under normal conditions is a bituminous liquid that depending on the conditions of certain factors its characteristics can change as it can become yellowish and slightly viscous like gasoline to black liquids and very viscous.
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Oil is a bituminous oily liquid (dark color) of natural origin composed of different organic substances (it is a mixture of hydrocarbons, although they also usually contain a few sulfur and oxygen compounds). It also receives the names of crude oil, crude oil or simply "crude." Although it is an oily liquid of dark color, it is considered a sedimentary rock. In a very complex mixture of variable composition, hydrocarbons of many boiling points and solid, liquid and gaseous states, which dissolve one another to form a solution of variable viscosity.
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Oil is the world's primary source of energy, practically all economic activities in the world are based on oil as an energy source, it is a non-renewable natural resource, that is, a world without oil is possible in the future. Oil is a leading resource worldwide because it has unique characteristics such as: it is abundant but limited because it is not a renewable resource, there are currently more than 70 countries that are dedicated to the exploitation of oil, another low cost of production to produce a barrel of oil beyond what you can think is around 7 or 8 dollars and it is an easy resource to transport due to its characteristics the transport becomes relatively easy and fast. We can conclude that oil is a great resource for many countries, including Venezuela, which has already approved the creation of the first local cryptocurrency "petro coin" based on oil reserves.
