Number of combinations created in this step: 9

12. Sedimentary Rock = Earth + Stone
13. Steam = Fire + Fog
14. Clouds = Fog + Water
15. Metals = Stone + Fire
16. Salt Water = Stone + Water
17. Sand = Stone + Wind
18. Amino Acids = Swamp + Lightning
19. NO2 = Air + Air + Lightning
20. Hydrothermal Vein = Earth + Volcano + Water