Saundra experienced some traumatic events in her childhood. According to cognitive theory, by rethinking and reorganizing her about these previous experiences, Saundra will be able to change her later experiences by developing a new working model.

well, there are a lot of places we get information about earth from. like science classes, websites, books, newspapers, etc.

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.