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| petroleum is one of the cheapest http://www.epgeology.com/general-geology-rock-identification-f49/petroleum-one-the-cheapest-t4300.html |
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| Author: | xuliekeya [ Wed Oct 02, 2013 8:10 am ] |
| Post subject: | petroleum is one of the cheapest |
Currently, petroleum is one of the cheapest and most portable forms of energy available. Without petroleum the worlds current level of technology would probably not exist. The world would simply not sustain the current level of population without the benefits that this source of energy has provided. |
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