Earth + Water = Mud
Air + Air = Pressure
Earth + Fire = Lava
Water + Water = Puddle
Puddle + Water = Pond
Pond + Water = Lake
Lake + Water = Sea
Earth + Sea = Primordial Soup
Fire + Fire = Energy
Primordial Soup + Energy = Life
Earth + Life = Human
Earth + Water = Mud
Air + Air = Pressure
Earth + Fire = Lava
Water + Water = Puddle
Puddle + Water = Pond
Pond + Water = Lake
Lake + Water = Sea
Earth + Sea = Primordial Soup
Fire + Fire = Energy
Primordial Soup + Energy = Life
Earth + Life = Human