What type of tectonic plate activity is created to form ha long bay, vietnam?

:calculate the sum of the interior angles of a 13-sided polygon.

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