what are grounds for divorce?(According to the law)?

http://www.deltabravo.net/custody/faultstates.php

In "Fault" divorces, the complaint for divorce must state grounds for divorce. They include cruel and abusive treatment, adultery, abandonment, and other types of misconduct.

(No longer quoting website) Divorce laws do in fact vary by state. The reasons cited above would seem to be pretty standard(?).

im not sure what you are asking but hopefully this helps what a judge usually asks is if the marriage is irrevertibly broken which means it can not be fixed. then if both parties agree then it gives you the grounds for the divorce but if one disagrees with the other they can contest the divorce then it is all up to what a judge says after he hears both sides. i hope this is what you were asking. if its not or u need more info email me and ill answer your question correctly or if u have anymore questions ive been divorced so i can help. best of luck.

depending on what state you live in all it takes is to agree there are irreconcilable differences "NO FAULT" :)

other wise some states require burden of proof ie. adultery, abuse, etc.

Depends what state or country you are in!

Adultery also if you feel your marriage is irretrieveably broken, domestic violence, Any kind of abuse.

It depends on where you live.