Final answer:
Hydroelectric power is a renewable energy source that does not produce greenhouse gas emissions. It can respond rapidly to changes in electricity demand and has a long history of use in generating electricity.
Step-by-step explanation:
One true statement about hydroelectric power is that it is a renewable source of energy. Hydroelectric power is generated by harnessing the energy from flowing or falling water, such as rivers and waterfalls, which is constantly replenished by the water cycle. Unlike fossil fuels, hydroelectric power does not produce greenhouse gas emissions, making it an environmentally friendly energy source.
Another true statement is that hydroelectric power plants can store water in reservoirs, allowing for the generation of electricity when demand is high. By controlling the flow of water through the turbines, hydroelectric power plants can rapidly respond to changes in electricity demand, providing a reliable source of power.
Lastly, hydroelectric power has been used for many years to drive water turbines, which generate electricity. The concept of hydropower dates back to ancient times when water wheels were used to power various mechanical devices. Today, hydroelectric power plants are built on a much larger scale and can generate significant amounts of electricity to meet the energy needs of communities.
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