By Kam Leung Isabelle Lindberg Johara Alangari

* Sulfur is the tenth most abundant element in the universe * It is a brittle, yellow, tasteless, and odorless non- metallic element. * Sulfur is found in all living organisms as a constituent of some proteins, vitamins, and hormones * The majority of the Earth's sulfur is stored underground in rocks and minerals, including as sulfate salts buried deep within ocean sediments.

* Sulfur gets released in to the atmosphere from natural sources * Sulfur eventually settles back into the Earth or comes down within rainfall. A continuous loss of sulfur from terrestrial ecosystem runoff occurs through drainage into lakes and streams, and eventually oceans. * Some of the sulfur falls the depths of the oceans combining with iron to form ferrous sulfide which is responsible for the black color of most marine sediments.

* Sulfur is one of the processes that allow natural weathering and other natural processes * Sulfur cycle does not allow acid rains because it regulates the amount of sulfur present in the atmosphere, hydrosphere, and lithosphere * Sulfur acid forms sulfuric acid smog when mixes with water vapor

* Since the Industrial Revolution, human activities have contributed to the amount of sulfur that enters the atmosphere * Emissions from these activities, along with nitrogen emissions, react with other chemicals in the atmosphere to produce tiny particles of sulfate salts which fall as acid rain * However, as particles and tiny airborne droplets, sulfur also acts as a regulator of global climate

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