This is where the Sulfur Cycle begins. The bottom of the ocean is home to sulfate salts because sulfur is an element known to be located deep beneath the earth's surface. Rocks located on the floor of such oceans, hold sulfur within them, so when they endure weathering from the oceans various conditions, they release that sulfur.
Those sulfur molecules make their way to the ocean's surface, and through making contact with the air, those sulfur molecules become sulfate.
The sulfur molecules also enter the grounds, as to which they sulfate the soil. The molecules enter a stage of decomposition.
Sulfate molecules are absorbed by plants and microorganisms. These plants and microorganisms are eaten by animals. This explains as to how sulfur passes through the food chain. When animals die and begin to decompose, traces of sulfur as sulfate is released back into microorganisms.
Through decomposition, sulfur enters the atmosphere as hydrogen sulfide. Along with volcanoes which release sulfur directly into the atmosphere in the form of hydrogen sulfide. Human emission can also be explanatory for sulfur molecules entering the atmosphere.
Through precipitation and simple fallout, sulfur molecules make their way back down from the atmosphere. Sulfur molecules enter terrestrial ecosystems as well runoff systems where rivers lead them back the hydrosphere, ocean, and marine ecosystems.