Across
- 3. The blanket of gases enveloping the Earth.
- 4. Largest ocean on Earth.
- 5. longest river in the World.
- 7. very small plants and animals living in the water.
- 8. acronym for a highly poisonous substance in aerosols.
- 9. coldest continent on Earth.
- 10. gaseous layer that protects from UV rays.
Down
- 1. moments in a year where the sun is farthest North or South during a year.
- 2. largest island in the world.
- 6. Shape of the Earth.