Chemistry — Formation of Fossil Fuels
How coal, oil and gas form over time.
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digraph FossilFuels {
rankdir=LR;
node [shape=box, style=rounded];
"Dead organisms" -> "Buried, no oxygen";
"Buried, no oxygen" -> "Heat + pressure over millions of years";
"Heat + pressure over millions of years" -> "Coal (plants)";
"Heat + pressure over millions of years" -> "Oil & gas (plankton)";
}