Various ways to end a marraige in Islam

Q) What are the various ways of ending a marraige in Islam and their respective conditions?

Awaiting response from Shaykh (Mufti) Ismail Moosa (HA)

http://euro-sunni.com/forum/viewtopic.php?f=5&t=347

Question Expanded:

http:// http://www.askimam.org/fatwa/fatwa.php?askid=0628880817cdbcc42ba2063cc06a9180

I would like to understand the various ways in which marriage can be ended in Islam and my humble understanding so far is that it can occur in three (3) main ways:

1) Talaq: This is the exclusive domain of the husband and ONLY the husband has the right to issue a Talaq (divorce).

http://www.central-mosque.com/fiqh/hdivorce1.htm

2) Khul: However, in the case where the husband refuses to issue a divorce, the wife may persuade the husband to enter into an agreement of Khul’ (a release for payment from the wife). The wife may also opt to forgive the husband from paying her dowry (mahr).

http://www.central-mosque.com/fiqh/khula.htm

3) Faskh of Nikah: An Islamic Shariah council of Ulema to consider annulling nikah. The Judicial Committee will follow the rules of faskh-e-nikah (annulment of nikah) to consider the application and issue a decree accordingly.

http://www.mahmoodiyah.org.za/faq210.htm

1. Question 1: Are these the three (3) primary ways of ending a marriage in Islam?
2. Question 2: What are the Shariah approved circumstances where a woman can ask for “Khul”?
3. Question 3:What are the Shariah approved circumstances where a "Faskh" can occur i.e. Ulama on an Islamic Shariah board can nullify the Nikah, depsite the husband refusing to issue Talaq or enter into a "Khul" agreement?