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Sulfur Cycle

By: Kyle Woo, Nijal Ferguson, and Austin Changras
by

Kyle Woo

on 3 October 2012

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Transcript of Sulfur Cycle

The Sulfur Cycle By: Kyle Woo, Nijal Ferguson, and Austin Changras In the Sulfur Cycle, sulfur circulates through the biosphere, and the majority of Earth's sulfur is stored underground in rocks and minerals in the form of sulfate salts buried in ocean sediments. Sulfur enters the atmosphere from many natural sources: Hydrogen sulfide - colorless, highly poisonous gas is released from volcanoes and broken down by anaerobic decomposers in flooded swamps. Sulfur dioxide also comes from volcanoes. Volcanoes release hydrogen sulfur and sulfur dioxide
into the atmosphere Particles of sulfate salts (ammonium sulfate) enter the atmosphere from sea spray, dust storms, and forest fires. Plant roots absorb sulfate ions as an essential component for proteins Certain marine algae produce large amounts
of volatile dimethyl sulfide, or DMS. DMS enters the atmosphere through condensation of water and evaporation. These can affect cloud cover and climate. Sulfate enters into the atmosphere from forest fires, dust storms, and ocean spray.
(Hydrosphere). DMS (Dimethyl Sulfide) from marine algae enters the atmosphere from condensation and evaporation.

Sulfur also from ocean sediment is broken down and evaporated in DMS. Which changes the climate of the clouds.
(Atmosphere). DMS in the atmosphere is converted to sulfur dioxide, which is turned into sulfur trioxide gas and droplets of sulfuric acid. DMS mixed with atmospheric chemicals (ammonia) produce tiny particles of sulfate salts. These particles fall into the earth's surface as acid deposition (acid rain) - harms trees and aquatic life. DMS and ammonia forming acid rain / deposition harms trees and aqua life. Flooded soils, freshwater wetlands, and tidal flats: specialized bacteria convert sulfate ions to sulfide ions. These sulfide ions react with insoluble metallic sulfides, then are deposited as rock / metal ores, and allows the cycle to continue. In oxygen-deficient environments, freshwater wetlands, tidal flats, and flooded soils have specialized bacteria that converts ulfate Ions into
ulfide Ions which react with insoluble metallic sulfides to be deposited as metal ores and rock. which allows for the cycle to continue Dead animal bodies are decomposed which serve as sulfur in rock and fossil fuels (matter of decay) This is also used to supply plants with nutrients Dead animal bodies decay into sulfur.
(Biosphere). which supplies plants with nutrients.
(Biosphere). Human activity affects the sulfur cycle by releasing amounts of sulfur dioxide into the atmosphere. D Done in 3 steps:
1. Burning sulfur-containing coal and oil to produce electric power.
2. Refining sulfur-containing oil (petroleum) to make gasoline, heating oil, and other useful products
3. Extracting metals (copper, lead, and zinc from sulfur-containing compounds in rocks that are mined for metals. Once this reaches the atmosphere, it is converted into acid deposition and acid rain. Human activity in burning sulfur-containing coal and oil To produce electricity, refining sulfur-containing oil to make gasoline, heating oil, and other products, and extracting metals (copper, lead, and zinc) in from sulfur-containing compounds in rocks are mined.
(Geosphere). Once sulfur is in the atmosphere, it is converted into acid deposition / rain. Sulfur is key for organisms to use oxygen. Plants absorb sulfur through their roots. It mostly can affect terrestrial and aquatic ecosystems. Anthropogenic deposition remains an environmental concern - clean air regulations in the U.S. have significantly lowered since 1995. Sulfur can react as an oxidant or reducing agent.
It oxidizes most metals and several nonmetals (carbon).
Also reduces strong oxidants (oxygen, floruine).
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