![](deu6e_ch6_fig_23.jpg)
Figure 6-23 The Regolith The Moon’s surface is covered by a layer of (a) powdered rock and (b) small pieces of rock. Called regolith, the powdered rock was created over billions of years as a result of bombardment by space debris; it sticks together like wet sand, as illustrated by this Apollo 11 astronaut bootprint.