"fuel consisting of the remains of organisms preserved in rocks in the earth's crust with high carbon and hydrogen content"@en-us . "110527530"@en-us . . "fossil fuel"@en-us . . . "0"^^ . . . "114686352"^^ . . . . . "113846365"@en-us . "fossil fuel"^^ . "14686352-n"^^ . "0"^^ .