The reason they call it a lake within a volcano within a lake within a volcano is because when it erruped in it created a creater that filled up with water around the volcano. Then, a later erruption created another crater within that volcano that then filled up with water and the top of the volcano was sticking out of that lake. This is still an active volcano that errupted in the late 1960's. If you look at the photo of the steam coming out of the ground you will see that the water down there is boiling due to cracks in the ground where the heat of the magma is felt.
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