Different salt concentrations.
Sea water is denser, not only that, different oceans have different densities.
Oil and Water
less than water different objects have varying densities
Within a Chemistry book that contains a section on the results of laboratory experiments that determine and define these parameters. This section may also list densities of water at different saline concentrations.
Different oils have different densities; usually a bit less than the density of water.
They would separate out because they have different densities.
Water that is more dense will flow beneath the water that is less dense
They have different densities, water being the heaviest of the two, so they do not mix.
true
because they have different densities. waters density is 1.000 and plastic is 3.842