http://littlealchemy.com/basically you start with air fire earth and water, and expand from there. Earth x2 or air x2 equals pressure, fire plus earth makes lava etc
pay attention to the blocky outline when mouseovering something, if it has a red square it can't be dabbled with, if the square is white feel free to experiment.
also, mix rain with sun and then mix two of the resulting thing. POP CULTURE REFERENCE.
NOTE: MOST MORE ADVANCED THINGS APPEAR AS A SUBSTACE IN A BOTTLE. THAT IS A PLACEHOLDER UNTIL A BETTER IMAGE APPEARS. i think.