Where do most phosphates and nitrates in the chesapeake bay come from

What is the speed of sound in water

Which of the following terms describes the layers of air surrounding the earth ?

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