What cataclysm occurred that eventually led to the moon's formation?

The cataclysm that occurred eventually leading to the moon’s formation is that the size of the planet mars has hit earth. Cataclysm is being defined as an event that is considered to be violent and that is likely to be in a large scale that occurs in the natural world.

hi   i took this test in k12 2 weeks ago your answer is the name of it 14 points it failed because america was not behind him with this idea and it nevr passed the sentate

2   irelenad and jews wernt with him because he was focusing more on the war then them