Across
- 1. a colourless, odourless, highly flammable gas
- 3. relating to or affected by tides
- 5. Hydro electric power
- 7. relating to or determined by the sun
- 8. relating to or produced by the internal heat of the earth
- 9. the perceptible natural movement of the air
- 10. a passive solar ventilation system composed of a hollow thermal mass connecting the interior and exterior of a building
Down
- 2. converted form of concentrated solar energy
- 4. it is made of material that comes from living organisms, such as plants and animals
- 6. a gas that contributes to the greenhouse effect by absorbing infrared radiation