Across
- 3. The smallest continent
- 6. 5.5% of __ is covered in ice
- 7. Continent of the North Pole
- 9. Occurred 15 billion years ago
- 11. Half of the earth divided by the equator
- 13. Ice covers 1/__ of the Earth
- 14. Stars form in a ___?
- 15. How do stars twinkle?
- 16. Organisms forming from organic building blocks
- 18. Countries south of Panama
- 19. Clumping smaller particles into larger masses
- 21. Largest of all oceans
- 25. aggregations of gas and dust
- 26. First surface formed __ years sgo
- 28. What Galaxy does Earth belong to?
- 29. Large star of high luminosity and low surface temperature
Down
- 1. Release of volatile substances and water vapor
- 2. 4.5% of __ is covered in ice
- 4. Bordered by Indian and Atlantic
- 5. Warmest of all the oceans
- 7. The smallest ocean
- 8. When a star blows up
- 10. Iron sunk to the middle of the planet
- 12. Massive spheres of incandescent gas
- 17. Includes USA, Mexico, and Canada
- 20. Land mass that consists of Europe and Asia
- 22. Heavy rains fell for __ years to form oceans
- 23. Stars, dust, and gas held together by gravity
- 24. Sailors used this to see speed of ship
- 27. Major shipping ocean