petroleum as it comes out from the ground and before it has been refined or processed into useful products
a resource that takes place so long to form that it can't be replaced. Oil which takes millions of years to form, is such a resource
oil that has been discovered but remains unused in the ground
a resource that can't be used up or that can't be used up. Sunlight is a renewable resource that cannot be used up as well as wood.
gross domestic product; the value of all goods and services produced in a country
GDP per capita
GDP divided by population; average income
human development index; per capita GDP, life expectancy, literacy rate, level of education
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