PETER BOWATER / SCIENCE PHOTO LIBRARY PETER BOWATER / SCIENCE PHOTO LIBRARY
Off-shore gas platform during construction. The derrick barge (right) is lifting part of the small gas platform (left) to put it in place. Gas platforms are usually anchored to the seabed, from which they extract natural gas by drilling. Natural gas, consisting mainly of the gases methane and ethane, is formed by the breakdown of organic matter. It occurs mainly at the top of oil wells, or in wells of its own. Photographed off the coast of England in the North Sea.
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