Across
- 2. a machine with blades that spin to produce power from water, wind, or steam
- 4. the supply of water to land or crops to help plants grow
- 8. causing no net release of carbon dioxide into the atmosphere
- 10. relating to heat that comes from inside the Earth
- 11. the act of sending out gas, heat, light, or pollution into the air
- 12. the process by which plants use sunlight to make food
- 13. the process of removing salt from seawater to make it fresh
Down
- 1. to produce or create something, especially energy or power
- 3. limited in amount and able to run out
- 5. knowledge or understanding of a situation or issue
- 6. a scientist who studies living things and how they interact with the environment
- 7. giving off energy in the form of radiation
- 9. a type of sugar that plants make and use for energy