Examples of renewable energy sources include which of the following?

• A. Hydroelectric, Solar, Biomass, Wind.
• B. Coal, Oil, Natural Gas, Nuclear.
• C. Geothermal, Oil, Coal, Gas.
• D. Wood, Plastic, Glass, Steel.

Answer: (A)

Renewable energy sources are those that come from resources that naturally replenish on a human timescale. Hydroelectric power uses the flow of water, solar captures energy from the sun, biomass comes from plant material that can regrow, and wind energy comes from air movement driven by solar-powered climate patterns. Because these sources can be replenished relatively quickly, they provide a sustainable way to generate energy. In contrast, fossil fuels like coal, oil, and natural gas are finite because they form over millions of years; nuclear energy depends on uranium, which is also not replenished on human timescales. The remaining option includes materials that aren’t energy sources, so it isn’t a valid set of renewable energy sources.