Large country-sized landmass transmutation [closed]

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?

• «how would this actually happen?» that has no answer that we can give. – JDługosz Jan 18 '17 at 22:37
• I'm completely lost as to what the question actually is, or what is happening. – Matt Bowyer Jan 18 '17 at 22:57
• Will be clearer. – Arfons Jan 18 '17 at 23:04
• 45% is atmosphere... is this describing what is being replaced or what it is being replaced with? – Zxyrra Jan 18 '17 at 23:22
• While instantly loosing 130km^3 of air would be a BIG problem for anyone or anything in the immediate vicinity (shockwaves and all that), in the long term, not that big of a problem really, the Earth already loses something like a 1/4 million tonnes of air a year to space and that's already around 160km^3 so... but yeah, the sphere crashing down would be bad, real bad (probably not to different to this) – Samwise Jan 19 '17 at 2:56