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Petroleum, consisting of crude oil and natural gas, seems to originate from organic matter in marine sediment. Microscopic organisms settle to the seafloor and accumulate in marine mud. The organic ..2014-08-09 编辑：alice
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1.Petroleum, consisting of crude oil and natural gas, seems to originate from organic matter in marine sediment.2015-05-08 编辑：mike
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Russia, the United States and other countries are hurrying to control Earth's northernmost territory: the Arctic. It is rich in oil and natural gas.2015-09-30 编辑：max
