renewable resources are replaced naturally over time and can be used repeatedly, while nonrenewwable resources aren't replaced naturally and are available in limited supply, their formation takes billions of years.
Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies. This is usually due to the long time it takes for them to be replenished. Renewable resources are replenished naturally and over relatively short periods of time.
