Water + Water = Lake
Lake + Lake = Ocean
Earth + Water = Plant
Plant + Wind = Dandelion
Dandelion + Wind = Seed
Seed + Fire = Smoke
Smoke + Water = Fog
Fog + Earth = Mud
Mud + Fire = Brick
Brick + Brick = Wall
Wall + Wall = House
House + Fire = Fireplace
Fireplace + Water = Steam
Steam + Fire = Engine
Engine + Fire = Rocket
Rocket + Fire = Dragon