The shape of which continental coastlines provides evidence for the continental drift hypothesis.
a. north america and australia
b. south america and eurasia
c. north america and eurasia
d. south america and africa

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

Which substance has non polar covalent bonds

The bohr model of the atom explained why emission spectra are discrete. it could also be used to explain the photoelectric effect. which is a correct explanation of the photoelectric effect according to the model?