a couple of answers im thinking of is oil and natural gas.
This entry was posted
on Tuesday, July 20th, 2010 at 2:14 pm and is filed under Petroleum.
You can follow any responses to this entry through the RSS 2.0 feed.
You can leave a response, or trackback from your own site.
One Response to “What source of energy is a natural byproduct of petroleum production?”
July 20th, 2010 at 2:14 pm
d