What do you use to find the actual amount of reactants

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

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?

What is an example of a physical property?