Which statement best describes nonrenewable energy sources?

Which statement best describes nonrenewable energy sources?

• A. Nonrenewable energy sources exist in limited quantities and cannot be replaced except over millions of years.
• B. They are always inexpensive to extract and have no environmental impact.
• C. They regenerate quickly after use.
• D. They are the only source of energy used in industry.

Answer: (A)

The main idea being tested is that nonrenewable energy sources are finite and take geological time to form. They exist in limited quantities and cannot be replaced except over millions of years. This captures why they are labeled nonrenewable: once we use them, the amount left cannot be quickly replenished, so their supply declines over time and we must manage them carefully or transition to alternatives. Examples like coal, oil, and natural gas illustrate how these resources come from ancient organic matter and are not readily regenerated on human timescales. That’s why this statement is the best description. It directly addresses scarcity and the extremely slow formation rate, which are the defining features of nonrenewable energy. The other statements don’t fit. Nonrenewables are not guaranteed to be inexpensive to extract, and they do have environmental impacts from extraction and burning. They do not regenerate quickly after use, since their formation spans millions of years. And they are not the only source of energy used in industry, as energy mix includes renewables and other sources alongside nonrenewables.

The main idea being tested is that nonrenewable energy sources are finite and take geological time to form. They exist in limited quantities and cannot be replaced except over millions of years. This captures why they are labeled nonrenewable: once we use them, the amount left cannot be quickly replenished, so their supply declines over time and we must manage them carefully or transition to alternatives. Examples like coal, oil, and natural gas illustrate how these resources come from ancient organic matter and are not readily regenerated on human timescales.

That’s why this statement is the best description. It directly addresses scarcity and the extremely slow formation rate, which are the defining features of nonrenewable energy.

The other statements don’t fit. Nonrenewables are not guaranteed to be inexpensive to extract, and they do have environmental impacts from extraction and burning. They do not regenerate quickly after use, since their formation spans millions of years. And they are not the only source of energy used in industry, as energy mix includes renewables and other sources alongside nonrenewables.