The introduction of a third party in politics can offer a new voice that may be missing create a new electorate split the vote of the leading party mean a need to amend the constitutional voting laws

the boundarys like convergent divergent and transform it causes subduction

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.