Re: Would they really breakup?
Oh.
Would they really breakup?
Not sure. I suppose a rock would explode for a few reasons- high gee deceleration (wouldn't be a factor with solid rock and relatively slow speed) and/or because of heat of the compressed air of the atmosphere (if you have a steep descent this would be less of a problem [less time for things to get hot also the iron/nickel ore would conduct heat well] and/or how areodynamic your object was- does it rapidly tumble at supersonic speed (don't know how cubes respond).
Probably, solid unfractured rock cubes wouldn't break up.