Examlex
In the textbook, the argument is made that the boundaries between regions are rarely, if ever, distinct and certain.
Oil And Gas
Natural resources that are extracted from the Earth and used primarily for energy and as raw materials in the production of chemicals.
Coal
A combustible black or brownish-black sedimentary rock formed from ancient plant matter, used primarily for electricity generation and steel production.
Oil Shale
Sedimentary rock that contains significant amounts of organic material in the form of kerogen, which can be converted into crude oil through heating.
Energy Resource
Any material or phenomenon that can be used directly or converted into other forms of energy to perform work.
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