Describe how fossil fuels are converted into usable energy

Fossil fuels are converted into usable energy by first collecting, and then I'm pretty sure its turned into gas and turns turbines.

There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.