Explain the weekly activity requirements for adults and what exercises and activities one can do to meet these requirements. (site 2)

The weekly activity requirements is just that an adult gets some amount of physical and mental activity where he uses his mind as well as does some sort of exercises so he remains fit.

In my opinion playing any sport such as football or basketball or tennis or even golf can make a person pretty active in both ways. Or some amount of jogging can be necessary and beneficial for an adult.

c. flammable gases, patient lying in standing water, combustible liquids near the victim