Why do nations should establish a set of rules and principles for responsible lunar/moon explortions? ASAP pleas :(

So that we do not contaminate it with microorganisms or garbage or other human stuff.

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;