As plant material decays it releases gas and moisture and carbon.
The first stage of coal formation results in the formation of Peat.
Peat is a layer of organic sediment. As peat is buried under more and more sediment, it changes into lignite, a soft brown coal with a lot less moisture then peat due to the increasing pressure pushing down on it.
Distillation of corn creates a biomass in the form of an alcohol, like ethanol.
If we mix ethanol with a fuel, like gasoline to produce gasohol, which can be used the same way as gas but it burns cleaner and allows us to use less fossil fuels, since we don’t have to make the total volume of the mixture pure gasoline.
Liquid biomasses like alcohol have more uses than solid ones.