system
Given the following post, respond as if you're commenting on Reddit:
human
If a softball sized black hole were created on the surface of the Earth, what would be the process of events?

In the 2009 movie "Star Trek," they use a drop of something called Red Matter to destroy Vulcan by drilling a hole to the core of the planet and then launching the Red Matter into the center of the planet.

I don't believe it is realistic, though.  My theory is that, if a softball sized black hole were created on the surface of our planet, the two center points of both masses would attract each other.  This would mean that the softball would "fall" through the ground and eventually reach the center of our planet, were it would simply just float in the center of Earth.  

Is this most likely the case?
gpt
If it truly acts as a black hole, then anything that ends up within its event horizon is not going to be able to get back out. It would fall to the centre of the earth, sucking up everything that it touches, without expanding significantly (since the total mass of the earth would be much smaller than the initial mass of the black hole, according to RobotRollCall's calculation). Eventually it is just going to sit at the centre of the earth, sucking the entire earth into it, since the earth's crust would not be able to mechanically support itself as an empty sphere once all of the liquid in the centre had gone. The remaining black hole would then probably fall into a closer orbit to the sun, since it would have the same angular velocity as earth to begin with, but a much higher mass.

EDIT: the closer orbit part isn't right; the mass of a satellite doesn't affect orbital radius. Thanks leberwurst!