The physics of that is insane to me. The pressure differential you'd need to launch something that heavy that high would be off the charts. So high it's shocking the ground doesn't just give way. The ground must be pretty solid.
Edit: I did some research. This is a lot more like a wet fart than I realized.
Dissolved gasses come out of solution where the pressure gets lower. These pockets of air make the magma a compressible fluid. This means if you have a shaft in which acceleration is happening the top can accelerate independently from the bottom. Not true if it were incompressible. As you get to the top of the shaft the pressure is even less so you get more gas out of solution and more acceleration out of that last part.
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The physics of that is insane to me. The pressure differential you'd need to launch something that heavy that high would be off the charts. So high it's shocking the ground doesn't just give way. The ground must be pretty solid.
Edit: I did some research. This is a lot more like a wet fart than I realized.
Dissolved gasses come out of solution where the pressure gets lower. These pockets of air make the magma a compressible fluid. This means if you have a shaft in which acceleration is happening the top can accelerate independently from the bottom. Not true if it were incompressible. As you get to the top of the shaft the pressure is even less so you get more gas out of solution and more acceleration out of that last part.