One of the major applications of density is taking advantage of objects that sink or float in water . For fishing , most people who fish have a " bobber " that floats on their line and a " sinker " that sinks on their line . From our list of substances , identify one substance we could use to make the floating " bobber " and one substance we can use to make the " sinker " . Explain your answer fully .

"bobber"

"sinker"