the trouble with gravity

[Talroth]

Have any plaster around? (Everyone should invest in a bag of sheetrock 90 or similar product every other year,...)

Mix some up, use about 20% more water than required and shape it roughly as you think your pre-crash land would be. Let it cure for a few days, then crash it. Record results.

[pickaboo]

Since the fallen continent and the planet are of approx. equal in physical properties, I predict that the smaller one would at least be cracked in half. This can be observed by smashing rocks together. It kinda depends what kind of ground you have on the collision spot.. if there were many caves and such, the damage might be minimal because the caves would collapse softening the impact.