Which option is an example of a surface wave? A. A light wave
B. A wave on top of water
C. A sound wave
D. A wave carried through a rope

Which of the following best describes the economy of africa?

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

Based on current rates the earths human population is expected to grow how much by 2050