Tornado alley is most closely associated with

How do convection currents form underwater mountains?

After considering options, a student using the problem-solving process should next

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted