Across
- 4. is also called CO2.
- 6. the surroundings we live in.
- 8. is something that puts you to the test, like running your first marathon.
- 9. is a state of being informed.
- 10. a type of solid fossil fuel.
Down
- 1. toxic gasses produced by cars, planes, factories.
- 2. a type of aeriform fossil fuel. Helium is a type of … .
- 3. a type of energy from the Sun.
- 5. is a dry season without rains.
- 7. a type of energy that can be regenerated.