Fire + Fire = Energy
Air + Fire = Energy
Earth + Fire = Lava
Air + Water = Rain
Earth + Water = Mud
Air + Earth = Dust
Earth + Lava = Volcano
Air + Lava = Stone
Fire + Stone = Metal
Air + Stone = Sand
Fire + Sand = Glass
Earth + Metal = Plow
Water + Water = Puddle
Puddle + Water = Pond
Pond + Water = Lake
Lake + Water = Sea
Sea + Water = Ocean
Earth + Ocean = Primordial Soup
Fire + Primordial Soup = Life
Air + Life = Bird
Earth + Life = Human
Human + Tool = Farmer
Earth + Fire = Lava
Lava + Air = Stone
Stone + Fire = Metal
Metal + Energy = Electricity
Electricity + Metal = Robot
Fire + Air = Energy
Energy + Energy = Star