[QUOTE=graciegirl;1075356]Seems that would be catastrophic and that is covered by homeowners insurance.
This is an ad, but has some good info;
Sinkhole vs. Catastrophic Ground Coverage Collapse[/
Following 4 things must occur for cat ground collapse to respond.
1. Must be visable
2. Must be sudden and abrupt
3. Immediate structural damage
4. Must be condemned
Sinkhole:
1. Does not have to be visible (could be under home)
2. Does not have to be sudden and abrupt (can open and then grow and do damage to home)
3. There has be be structural damage
4. Does not have to be condemned