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water cycle |
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water cycle the circulation of the earth's water, in which water evaporates from the sea into the atmosphere, where it condenses and falls as rain or snow, returning to the sea by rivers or returning to the atmosphere by evapotranspiration water cycle [′wȯd·ər ‚sī·kəl] (hydrology) How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Scientists suspect that methane moves back and forth between the atmosphere and the surface of Titan, just like water cycles between ground and sky on Earth. If the lakes are indeed composed of methane, the hydrocarbon would cycle between Titan's surface and atmosphere just as water cycles on Earth. Fluctuating water cycles are critical to maintaining the food chain which, in turn, increases the variety of life, says Wilcox. |
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