Which word refers to any system that uses an exchange medium-whether its a precious metal or government-printed paper-that can be traded for other goods

Any system that uses a medium for the exchange for other goods, uses money. Money is an exchange medium that can be in the form of coins, banknotes or some other precious metal. It has its value, which is determined on the basis of many economic parameters, and this value depends on the economic stability of the state. Each country has its own currency as a medium of exchange in transactions, in sense that everyone in the economic transactions agrees to accepts that money.

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.

well to answer ur question to be completly honest