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KEY TERMS
• SO2 : Sulfur Dioxide Gas
• H2S : Hydrogen Sulfide Gas
• SO4 : Sulfate Compound
Sulfur Dioxide• Less than 1% of atmosphere
• Found in atmosphere from volcanoes and industrial activity
• Compounds fall or are rained out of atmosphere
• Plants take in forms of this compound and absorb into tissues
• After plants die or are consumed by animals, organic sulfur compounds are returned to land or water
Oceans
• Some phytoplankton produce chemicals that transform to SO2
• Gases produced re-enter the atmosphere, water, soil
• Continues cycle
Biological and Ecological Effects
• Sulfur is a vital ingredient to proteins
• Plants take sulfur compounds out of water
• Some animals are dependent on plants that absorb sulfur