The air that people breathe is a mixture that contains primarily oxygen and nitrogen. The nitrogen generally makes up approximately 78%, while oxygen makes up 21%. Other gases, including carbon dioxide, hydrogen, helium, argon, and neon, make up the remainder. These gases dissolve and are carried in the blood.
Permissible work hours for 14- and 15-year-olds are: 3 hours on a school day; 18 hours in a school week; 8 hours on a non-school day; 40 hours in a non-school week; and; between 7 a.m. and 7 p.m., except from June 1 through Labor Day, when nighttime work hours are extended to 9 p.m. Child labor laws vary from state from state. Please consult your state department of labor for this information. DOL Web Pages on This Topic
8. Personnel participating in off-duty employment will submit a report of hours worked verified by the organization NLT the 10th of each month. The report will state the number of hours worked in the preceding month.