What happens to the pressure as one progresses through the layers of the earth from the inner core out to the crust?
a. pressure increases
b. pressure decreases
c. pressure remains the same

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