Petroleum is a naturally occurring, yellow-to-
Aug 1, 2013
We have a few videos on "Mineral and Power Resources" of Class VIII Geography. Watch it for your reference - to find an answer to this question. HD 8: 12.
because it is so 'useful' for example we use them in cars, and also because it is
so rare like
Jul 1, 2013
Although it is often
Feb 27, 2011
The U.S. has succeeded in lifting its oil production to over 8 million barrels per
day, the highest ...
"In the 1970s, OPEC was able to raise the world price in
Mar 11, 2012
petroleum,. oily, flammable liquid that occurs naturally in deposits, usually
beneath the surface of the earth; it is also