3. What did early South American civilizations achieve?

The history of South America is the study of the past, particularly the written record, oral histories, and traditions, passed down from generation to generation on the continent of South America.

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.