Figure 10-1: R I V U X G
Comparing Earth and the Moon (a) The Moon is a bit more than one-quarter the diameter of Earth. The average Earth-Moon distance is about 30 times Earth’s diameter. (b) Earth has blue oceans, an atmosphere streaked with white clouds, and continents continually being reshaped by plate tectonics. By contrast, the Moon has no oceans, no atmosphere, and no evidence of plate tectonics.
(a: NASA; b: Earth: NASA Goddard Space Flight Center Image by Reto Stöckli; Moon: NASA/GSFC/Arizona State Univ./Lunar Reconnaissance Orbiter)