Of the solar energy that falls on Earth, what percentage do land and oceans absorb? A. more than 50%
B. approximately 30%
C. approximately 19%
D. less than 6%

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