Oil

What is petroleum?Petroleum is a complex mixture of hydrocarbons that occur on Earth in liquid, gaseous, or solid form. The term is often restricted to the liquid fo. . What is the first known use of the word petroleum?The word petroleum was first used in 1556 in a treatise published by the German mineralogist Georgius Agricola. It means, literally, “rock oil,” fr. . Where are there rich reserves of petroleum?Major petroleum-producing countries and regions include Venezuela, Saudi Arabia, Canada, Iran, Iraq, Kuwait, Russia and the Caspian Sea region, Wes. [pdf]
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Solar power is good renewable energy source

What is solar energy?Solar energy is the radiation from the Sun capable of producing heat, causing chemical reactions, or generating electricity. The total amount of so. . What are the common uses of solar energy?Solar energy is commonly used for solar water heaters and house heating. The heat from solar ponds enables the production of chemicals, food, texti. . How is solar energy collected?The most common devices used to collect solar energy and convert it to thermal energy are flat-plate collectors. Another method of thermal energy c. [pdf]
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