Across
- 3. A long period without rainfall, causes shortages of water.
- 4. Another name for a tropical storm.
- 7. A person who fights for a cause is an ______.
- 8. A gas that causes global warming that is emitted by cattle
- 9. A replacement for fossil fuels.
Down
- 1. The warming when solar energy is trapped by the gases.
- 2. A gas that is released from fossil fuels.
- 5. A substance that is released is called and____.
- 6. A person who works for free, to help a cause.