what is risk?
-risk can be defined as the chance of an event occurring,multiplied by the damage or loss should that event take place
-for instance,a high risk activity -say,going over a waterfall in a barrel
-is one that has both a signficant chance of a negative outcome -e.g,it is likeky the barrel will break,
-and a large impact if that outcome occurs -the person is severely injured.