Images Dated 22nd October 2004

Glamorgan Colliery

Police guarding the Glamorgan Colliery during the strikes and riots in the coalmining town of Tonypandy, in the Welsh Rhondda, November 1910.
(Photo by Topical Press Agency/Hulton Archive/Getty Images)

© 2004 Getty Images

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Mouth of the mississippi, Landsat image

Mouth of the Mississippi river, Landsat 7 satellite image. Draining much of North America, the Mississippi carries large quantities of sediment into the Gulf of Mexico and along the coast of Louisiana (light blue areas). Modern farming techniques mean much of this sediment contains phosphorus and nitrogen from fertilisers. These nutrient-rich effluents cause an explosion in the summer population of phytoplankton. When they die, the bacteria responsible for decomposition absorb oxygen in the water leading to a dead zone on the ocean floor where few animals can live. Autumnal storms stir the water and clear the dead zone until the following year. Photographed in 1999

© NASA/SCIENCE PHOTO LIBRARY