Across
- 6. Most abundant gas in Earth’s atmosphere
- 7. Killer whales are actually ________.
- 8. Biggest producer of oxygen on Earth.
- 9. Largest desert in the world
Down
- 1. Most common mineral on Earth
- 2. These type of clouds are the most fluffy and can be seen on sunny days.
- 3. Polar bear’s fur is originally ________.
- 4. How many phases does the moon go through every 29.5 days?
- 5. Smallest bone in the human body
- 7. Helium changes our voice because of its ________.