Water + Fire = Steam
Earth + Water = Plant
Plant + Fire = Smoke
Smoke + Water = Fog
Earth + Fire = Lava
Lava + Water = Stone
Stone + Fire = Metal
Plant + Plant = Tree
Tree + Fire = Ash
Ash + Water = Mud
Mud + Fire = Brick
Plant + Water = Swamp
Swamp + Earth = Life
Life + Earth = Human
Human + Fire = Cook
Cook + Food = Meal
Plant + Human = Farmer
Farmer + Plant = Food
Water + Plant = Food
Earth + Plant = Food
Fire + Food = Cooked Food