COAL：Coal - Education | National Geographic Society

coal   bong da .wap.vn Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity. It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion burning

exhibition EXHIBITION definition: 1. an event at which objects such as paintings are shown to the public, or the act of showing these…. Learn more

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