Read the text and choose the correct answer.
All life depends on energy. The Earth and our solar system get most of their energy from the sun. Without the sun, life on Earth would not exist. The sun shines on plants, giving them the energy they need to grow and thrive. Animals then eat the plants, which gives them energy, too. Energy is everywhere. It is all around us.
Energy comes from nature. Wind, sun, water, fire, and lightning are all energy sources. In the United States, the most used sources of energy are fossil fuels such as coal and oil. The energy from fossil fuels gives us most of the electricity that lights and heats our homes. Oil also provides us with the gasoline that runs our cars. Unfortunately, the burning of fossil fuels pollutes the air.
Scientists are working to develop new ways of providing energy without harming the Earth. Through advances in research of alternative energy sources, the world is slowly changing from using fossil fuels to using wind power, water power, and solar energy. Windmills are used to capture wind power. Dams help to harness the energy from water. Solar panels collect energy from the sun's rays and keep it stored for future use.
