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Q15: What is a renewable energy source?
A15: One that naturally replenishes (e.g. solar, wind, hydro).
Q16: What is a non-renewable energy source?
A16: One that will eventually run out (e.g. coal, oil, gas).
Q17: Name 3 renewable energy sources.
A17: Solar, wind, hydroelectric.
Q18: Name 3 non-renewable energy sources.
A18: Coal, oil, natural gas.
Q19: What are the environmental problems with fossil fuels?
A19: They release greenhouse gases, cause air pollution, and contribute to climate change.
Q20: What is an advantage of using solar energy?
A20: It is clean, renewable, and reduces dependence on fossil fuels.