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News -02-19-09 Plate Tectonics Essential for Life? (MSNBC News) "So planets and moons that lie beyond habitable zones could host life, so long as the habitat, such as an ocean, is not isolated. It needs access to the key ingredients of life, including hydrogen, oxygen, nitrogen, phosphorous and sulphur. These elements support the basic chemistry of life as we know it, and the material, Spohn argues, must be regularly replenished. Nature's method of achieving this on the Earth appears to be plate tectonics." "Plate tectonics is also involved in the generation of a magnetic field by convection of Earth's partially molten core. This magnetic field protects life on Earth by deflecting the solar wind. Not only would an unimpeded solar wind erode our planet's atmosphere, but it also carries highly energetic particles that could damage DNA." "It has also been speculated that the lack of tectonic action on Venus contributed to its runaway greenhouse effect, which resulted in the immense temperatures it has today." Visitors sometimes misspell as tecktonics, tectoniks, or tecktonicks. 02-09 -02-19-09 Plate Tectonics Essential for Life? (MSNBC News) "So planets and moons that lie beyond habitable zones could host life, so long as the habitat, such as an ocean, is not isolated. It needs access to the key ingredients of life, including hydrogen, oxygen, nitrogen, phosphorous and sulphur. These elements support the basic chemistry of life as we know it, and the material, Spohn argues, must be regularly replenished. Nature's method of achieving this on the Earth appears to be plate tectonics." "Plate tectonics is also involved in the generation of a magnetic field by convection of Earth's partially molten core. This magnetic field protects life on Earth by deflecting the solar wind. Not only would an unimpeded solar wind erode our planet's atmosphere, but it also carries highly energetic particles that could damage DNA." "It has also been speculated that the lack of tectonic action on Venus contributed to its runaway greenhouse effect, which resulted in the immense temperatures it has today." Visitors sometimes misspell as tecktonics, tectoniks, or tecktonicks. 02-09

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