What is the contour interval

Explain why the rate of urbanisation is in the way it is between developed and undeveloped countries.

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

Which of the following is an example of relocation diffusion