Sean McMahon

Earth and Planetary Sciences

1. Mars 100%
2. Fossil 70%
3. Biosphere 65%
4. Preservation 62%
5. Rock 45%
6. Ediacaran 41%
7. Basalt 38%
8. Habitability 32%
9. Habitat 32%
10. Implication 30%
11. Biomass 28%
12. Record 28%
13. Methane 26%
14. Mineral 26%
15. Model 26%
16. Micro-Organism 25%
17. Datum 25%
18. Sample 25%
19. Carbon 23%
20. Experiment 21%
21. Pyrite 20%
22. Investigation 20%
23. Support 19%
24. Depth 19%
25. Taphonomy 19%
26. Hydrogen 18%
27. Show 18%
28. Decay 18%
29. Early Earth 18%
30. Condition 17%
31. Time 17%
32. Garden 17%
33. Chert 17%
34. Death 16%
35. Region 15%
36. Occurrence 15%
37. Preserve 15%
38. Phosphorite 15%
39. Sampling 15%
40. Paleobiology 15%
41. Fauna 15%
42. Land 14%
43. Microfossil 14%
44. Sediment 13%
45. Fossilization 13%
46. Laboratory 12%
47. History 12%
48. Affinity 12%
49. Water 12%
50. Environment 12%