Water + Fire = Steam
Earth + Water = Mud
Mud + Fire = Brick
Brick + Brick = Wall
Wall + Wall = House
House + House = Village
Village + Village = City
City + City = Country
Country + Country = Continent
Continent + Continent = Planet
Planet + Fire = Sun
Sun + Planet = Solar System
Solar System + Galaxy = Universe
Earth + Planet = World
World + Fire = Lava
Lava + Water = Stone
Stone + Pressure = Coal
Coal + Pressure = Diamond
Coal + Fire = Ash
Ash + Water = Mud
Mud + Plant = Swamp
Swamp + Time = Oil