Evidence for sea-floor spreading has come from a. changes in the
depth of the ocean.
b. magnetic minerals
on the
ocean floor.
C. ancient climatic
conditions.
d. the breakup of
Pangaea.

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