Read the text and choose the correct answer.
Alternative energy comes from sources that are not fossil fuels, such as wind, solar, hydroelectric, and geothermal. These sources are renewable, which means they can be (16) ____________ up again naturally over time. Alternative energy is important because it can help reduce our dependence (17) ____________ fossil fuels and reduce greenhouse gas emissions that (18) ____________ to climate change.
Wind energy is generated by wind turbines that convert wind into electricity. Solar energy is generated by solar panels that convert sunlight into electricity. Hydroelectric energy is generated by water turbines that convert the kinetic energy of (19) ____________ water into electricity. Geothermal energy is generated by tapping into heat from the Earth's core.
Alternative energy sources have many (20) ____________ over fossil fuels. They are renewable, which means they will never run out, unlike fossil fuels which are finite resources. They also produce less pollution than fossil fuels and are better for the environment.