SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Caspian Sea oil rig with people sunbathing on a beach in the foreground. Oil rigs are platforms used to drill for and pump oil from below the Earth's surface. Oil is the fossil fuel that powers much of the world's cars and industries, and which is also used to produce materials like plastics. The Caspian Sea is an oil-rich region, and is also a popular tourist destination for the surrounding areas. Photographed in July 2004, on the Caspian Sea coast near Baku, Azerbaijan.
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