1. By Kam Leung Isabelle Lindberg Johara Alangari

2. * 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.

5. * 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.

6. * 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

7. * 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

9. * "Desktop Wallpaper · Gallery · 3D-Art · Art Nature | Free Background 1024x768." Desktop Wallpaper · Wallpapers Downloads | Free Background. Web. 23 Nov. 2010.. * "Sheep Clouds." Alaska Stock Photography - Alaska Pictures and Photos from the Last Frontier. Web. 23 Nov. 2010.. * "Sulfur Cycle." The Environmental Literacy Council. Web. 23 Nov. 2010.. * "Sulfur Cycle." Water Treatment and Purification - Lenntech. Web. 23 Nov. 2010..