Question

Which of the following is an example of density? (1 point)
ice floating on top of a river
convection currents that cause wind
oil spill cleanup
all of the above

Answer 1

Well to understand your question you must know what density is.
Density: "The mass density or density of a material is its mass per unit volume"
With this statement you can use the process of elimination.
B. convection currents that cause wind
Is certainly wrong for multiple reasons.
Since B is out, that means D. all of the above is wrong too.
C. oil spill cleanup, what does that have to do with density?
We are left with A.