How can the layering liquids experiment be related to any environmental issue that includes similar processes?

Question

How can the layering liquids experiment be related to any environmental issue that includes similar processes?

Answer 1

this sounds like one liquid floating on top of another because it is less dense

environmental issue:

smog is more dense & has more environmental harm lower in a valley where it sinks

water running off the land into the ocean  begins by floating on top of the salt water in an estuary

the earths "conveyor belt" currents are in part due to more dense waters sinking in less dense water. this happens at the polar regions and the re-supply of surface waters keep the oceans circulating from the equator to the poles