Earth + Water = Mud
Fire + Water = Steam
Earth + Fire = Lava
Air + Water = Rain
Earth + Wind = Dust
Mud + Fire = Brick
Brick + Brick = Wall
Wall + Wall = House
House + House = Village
Village + Village = City
Water + Earth = Plant
Plant + Plant = Tree
Tree + Tree = Forest
Fire + Earth = Volcano
Volcano + Water = Island
Island + Island = Continent
Continent + Continent = Planet
Planet + Planet = Star
Star + Star = Galaxy
Earth + Life = Human