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