Phosphorus Cycle -Various forms of Phosphorous is cycled through water, the earths crust, and living organisms. Sulfur Cycle -Sulfur enter the atmosphere from natural sources. Hydrogen sulfide, from active volcanoes, and decay of organic matter by anaerobic decomposers. Sulfur dioxide from active volcanoes. Particulate sulfate from sea spray.
Water is an important medium for the movement of nutrients into and out of ecosystems.
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