Life's Rocky Start

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