PLEASE HELP
2.0 x 10410
OTX
8.0 x 10

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

In 2002, the rare earth elements mine in mountain pass, california was closed because

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.