being protected from use has a uncertain rocks on an animal's aluminum
coaster is not protective_covering. aluminum_sulfide is toxic_substance. aluminum is unalloyed_metal. aluminum is not metals_mining. turtles has hard_protective_shells aluminum_foil is not physical_surface. aluminum is metals_mining. aluminum is not unalloyed_metal. aluminum_sulfide is not toxic_substance. aluminum_foil is not aluminum.