Biomass is an important renewable energy form that includes the use of food, wood, straw, vegetable oils, and wastes from forests, agriculture, and industry. Energy is captured from biomass by burning it to produce heat, steam, and electricity. Fossil fuels include different types of oil, gas, and jet fuel that are extracted from the earth. They form from the remains of prehistoric plants and animals and are non-renewable resources. Hydroelectric energy produces power through dams that trap water in valleys and lakes. Water is allowed to flow through tunnels in dams, turning turbines that drive generators to produce electricity.