Biology — Sulfur Cycle
Movement of sulfur through the environment.
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digraph Sulfur {
rankdir=LR;
node [shape=box, style=rounded];
"Sulfate (SO4)" -> "Plants & microbes" [label="assimilation"];
"Plants & microbes" -> "Organic sulfur";
"Organic sulfur" -> "H2S" [label="decomposition"];
"H2S" -> "Sulfate (SO4)" [label="oxidation"];
"Volcanic / fossil" -> "SO2" [label="emission"];
}