Across
- 2. says younger layers of rock are deposited on top of older layers (3 words)
- 6. Iridium-rich material (2 words)
- 9. lack a nucleus
- 10. proposed the idea of continental drift
- 11. live in extreme environments
- 13. moving of the land formation of the Earth (2 words)
- 14. any preserved evidence of an organism
- 17. says only living organisms can produce other living organisms (3 words)
- 19. first to experiment with spontaneous generation
- 24. tested the soup model (3 words)
- 25. says life arises from nonlife (2 words)
- 26. person who studies fossils
- 27. mammals became dominant and humans appeared
- 28. formed when magma cools in Earth's interior (2 words)
- 29. gave the Primordial Soup model (3 words)
- 30. proposed the endosymbiont theory
- 31. flowering plants developed, mammals appeared, and dinosaurs existed
Down
- 1. the record of Earth's history (3 words)
- 3. says prokaryotic cells entered another cell and evolved into organelles (2 words)
- 4. photosynthetic microorganisms
- 5. method used to determine the age of rocks by comparing to others
- 7. formed when rock is exposed to heat/pressure (2 words)
- 8. fist to support biogenesis
- 9. says Earth's outer shell is made of many individual interacting sheets of rock (2 words)
- 12. elements with same number of protons and a different number of neutrons
- 15. protects Earth from the sun's rays (2 words)
- 16. uses the decay of radioactive isotopes to measure the age of the rock (2 words)
- 18. unstable element that releases particles and energy
- 20. formed by layers of loose materials (2 words)
- 21. plants appeared and the Cambrian Explosion happened
- 22. have a nucleus
- 23. building blocks of proteins (2 words)