Because it lies at the crossroads of four tectonic plates, mexico’s central plateau a. is too geographically unstable to support a large population. b. is frequently hit by tropical storms and hurricanes. c. is the site of frequent earthquake and volcanic activity. d. is a poor area for farms and ranches.

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