Which of the following best defines Nonrenewable resources?

• A. Water and air
• B. Forests and wildlife
• C. Fossil fuels, nonmetallic minerals, and metallic minerals
• D. Geothermal energy

Answer: (C)

Nonrenewable resources form over geological time and cannot be replenished on human timescales. They include fossil fuels, which come from ancient plants and organisms transformed under heat and pressure, as well as metallic and nonmetallic minerals concentrated by geological processes. Because these materials accumulate extremely slowly and finite in quantity, once they’re used, there’s no way to replace them quickly.

Water and air cycle continuously and are renewed by natural processes, so they’re considered renewable on human timescales, though they can be degraded by pollution or overuse. Forests and wildlife can also regenerate with proper management, making them renewable resources when treated sustainably. Geothermal energy relies on heat from within the Earth, which is effectively renewable with careful management.

Thus, the option listing fossil fuels, nonmetallic minerals, and metallic minerals best defines nonrenewable resources.