Final answer:
The correct answer to the student's question is option a, which states that renewable energy is energy that replaces itself within a human lifespan. Option a is correct
Step-by-step explanation:
Option a is correct. Renewable energy is one that replaces itself within a human lifespan. This means that a renewable resource is a natural resource that can be replenished by natural processes as quickly as humans use it. Solar energy, wind, and hydroelectric power are examples of renewable energy because they are continuously available and replenished on a human timescale. Therefore, the correct answer to the student's question is option a.
Renewable energy is energy that comes from sources that can be replenished by nature at the same rate or faster than humans use it up. For example, solar energy is considered renewable because sunlight is not used up when a solar panel is placed in the sunlight.
Renewable energy sources can include wind, water, geothermal, and solar power. They are different from non-renewable energy sources, like fossil fuels and nuclear power, which are depleted by consumption over human time scales.
By using renewable energy sources, we can reduce our dependence on non-renewable resources, reduce pollution, and combat climate change.