Which of the following energies cannot be renewed in a practical timeframe?

Nonrenewable energy resources are defined as resources that exist in finite amounts and cannot be replenished in a practical timeframe on a human scale. Examples of nonrenewable resources include fossil fuels such as coal, oil, and natural gas. These resources took millions of years to form and, once consumed, will not be available for future use within a reasonable timeframe.

In contrast, renewable energy sources like solar energy, wind energy, and biodiesel are naturally replenished and can be reused continuously. For instance, solar energy comes from the sun, which will continue to provide energy for billions of years, while wind energy harnesses the natural movement of air, which is constantly available. Biodiesel, derived from organic materials, can also be produced as long as there are sufficient feedstocks available.

Thus, nonrenewable energy resources are the only category that cannot be renewed in a practical timeframe, making this answer the correct choice.