So I have a plot in a story I'm writing where a mage turns a large landmass in the middle of a continent - think something like India - suddenly being consumed by a spell and turned into a dense sphere or disc a couple kilometers across. This would be something that'd consume everything in a 1000km radius sideways and maybe 10 km upwards and downwards ( an actual 1000km sphere would definitely be nothing short of a complete cataclysmic event ), give or take, in a matter of seconds and turn it all into said dense sphere/disc.
- ~45% is atmosphere
- ~40% is soil and crust
- ~5% is fauna and flora ( probably even less? )
- ~10% water ( probably more? rivers and some small part of an ocean )
Assuming this doesn't create a catastrophic vaccuum - which I'm sure would be the actual result - and instead takes a few days for the environment to normalize, how would this actually happen?
I'm assuming, for a roughly Earth-sized planet, that'd be a significant loss of atmosphere, the ocean's water would rush in and lower the world's water level ( but I don't know by how much? ), there'd be some significant volcanic activity and, of course, the resulting sphere/disc with all that matter would crash down and probably strike the crust at a rather high velocity...Could the planet survive?
This would be something like 130km³ of land and 130km³ of air being "displaced".
Would the planet - assuming it's Earth-like - survive this event?
How much would losing 130km³ of atmosphere affect said planet?
Assuming the ellipsoid is at roughly sea level, something like 130km³ of water would rush in - what would be the effects of such an event on the ocean as a whole?
Would there be some sort of volcanic activity from such an area losing such a part of the crust?
Would the resulting sphere/disc/ellipsoid - which would be 1/500th of the size of the original - be so heavy and dense it'd result in a significant event by itself, from falling some 2km?