1. …………….energy comes from the heat of the sun ( nhiệt). 2. ……………….can be produced by dead plants and animals as they decay (phân hủy). 3. …………………..is often found in the ground (đất), consisting mainly of methane (CH4) 4. …………………energy is energy that comes from the force of moving water. 5. ……………… is flammable (có thể cháy được) black hard rock, used as a fossil fuel (Nhiên liệu hóa thạch). 6. ………………., commonly known as (thường được biết đến) petroleum, is the largest source of energy (nguồn năng lượng) in the US. 7. To produce……………………energy, atoms are split apart (bị tách ra), which releases energy (tạo ra năng lượng). 8. ……………….energy is produced from moving air with the help of large turbines ( tua bin).