In the late 1800's various principles (original horizontality, inclusions, cross cutting relations, etc. arête) were established and used to organize the order in which events occurred on earth prove that evolution was a valid theory that could explain many geologic observations determine the age of the earth determine the age of events on the earth

i know social security wasn't one.

explanation:

hope my answer has you!

depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.