Name three ways chemists keep track of amounts of substances

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Asolid that forms and separates from a liquid mixture is called