Can a 25 mile high volcano form naturally on a desiccated desert earth planet?

The enormous shield volcano that this question was based on was held up by magic or God. It presented some very interesting conditions for alternate worlds so I thought I would develop that train of thought to see if something similar could actually exist without the intervention of Gods or magic.

Assume an Earth-like world with standard atmospheric pressure, except with 95% of the water missing (less water arrived when the planet formed). So a desert world, but still inhabited as there is still some water.

Let's be a little more conservative than the original question was. Can we have volcanoes extending 25 miles up into the stratosphere? If not, why and, if we can, roughly how high might they reasonably be expected to get (rough estimate)?

Edit: assume 25 miles above the mean planetary surface level

posted about 7 years ago

Slarty‭

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