Across
- 2. which ocean is the warmest
- 6. early steps of organisms forming organic building blocks
- 8. what chemical element made the planets, stars, oceans,etc
- 10. who experience with atmosphere gases
- 11. the star collapse explosion
- 12. how many galaxies are there
- 13. our galaxy name
Down
- 1. when was the earth form
- 3. why stars shine
- 4. how long did the accretion period last
- 5. which land is the smallest
- 7. one of the galaxy shapes
- 9. the northern ocean