Answer:
Fossil Fuels
Step-by-step explanation:
The reason why fossil Fuels are a nonrenewable source is because, fossil Fuels are things like, Gasoline, and coal, and those things are fossil Fuels, from millions of years ago, and were from dinosaurs. And since dinosaurs are no longer around, once we run out of fossil Fuels, there will be no more. So in conclusion, Fossil Fuels are a nonrenewable source.