Across
- 7. Creature that thrived during the Cambrian explosion of biological
- 8. Ancient city in Morocco
- 11. One of the longest-lasting materials in nature
- 12. Yosemite is known for it's biological __________
- 15. Father of evolutionary biology
- 16. Rock that fell from space
- 18. Fossilised ancient microbial structures
- 20. Measurement in years of Earth's age
Down
- 1. Earth's first rocks
- 2. Life around hydrothermal vents thrives on __________ energy
- 3. Molecule that is essential for all life
- 4. Biological process that turned Earth red through iron oxidation
- 5. Clay surfaces can act as __________ to make complex organic compounds
- 6. Rock that forms the foundation of continents
- 9. Building blocks of life that can be made from non-organic materials
- 10. Scientist who performed an early earth experiment
- 13. Carbon dioxide is a __________ gas
- 14. One of the oldest places on Earth
- 17. __________ is needed to split molecules
- 19. Gas that was rare in the early atmosphere