Which term describes resources that come from inexhaustible sources such as the sun, the earth's atmosphere, and large ocean bodies?

• A. Renewable
• B. Flow or perpetual
• C. Nonrenewable
• D. Perpetual natural resources

Answer: (B)

Resources that come from inexhaustible natural processes are flow resources, also called perpetual resources. Their energy comes from sources that are continuously renewed—like sunlight, wind, ocean currents, tides, and geothermal energy—so the supply remains effectively constant over human time scales. Even as we use some amount, the source keeps renewing itself, making these resources appear inexhaustible for practical purposes. This distinguishes them from finite nonrenewable stocks and from renewable stock resources (such as forests or fish) that must be managed to avoid depletion.