Here are the different combinations to make a volcano in Alchemy 2.
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container + lava
earth + lava
fire + hill
fire + mountain
hill + lava
hill + pressure
lava + mountain
mountain + pressure
How to make a volcano in Little Alchemy 2?
container + lava
earth + lava
fire + hill
fire + mountain
hill + lava
hill + pressure
lava + mountain
mountain + pressure