According to sociologist max weber's classic definition, class refers to social ranking of people who share

   Social-economic conditions

Explanation:  Classes, according to Weber, mean the subdivision of people into groups or social categories according to their economic power and social status. This means that all members of one class share the same opportunity to acquire a certain amount of money and wealth, as well as a certain influence on the basis of which they could acquire that wealth. These opportunities and influences determine the status, privileges, honors, and all this again determines the position in the market, where it actually determines which class someone will belong to. So there are lower, middle, upper classes. Weber was of the opinion that being born in a particular class generally determines belonging to a class, because it is difficult if someone born in a lower class becomes a member of the middle class and the like. More specifically, one who is born in the upper class has the greatest chance of being rich.

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.

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.