  The regolith-covered surfaces of asteroids preserve records of geophysical
processes that have occurred both at their surfaces and sometimes also in their
interiors. As a result of the unique micro-gravity environment that these
bodies posses, a complex and varied geophysics has given birth to fascinating
features that we are just now beginning to understand. The processes that
formed such features were first hypothesised through detailed spacecraft
observations and have been further studied using theoretical, numerical and
experimental methods that often combine several scientific disciplines. These
multiple approaches are now merging towards a further understanding of the
geophysical states of the surfaces of asteroids. In this chapter we provide a
concise summary of what the scientific community has learned so far about the
surfaces of these small planetary bodies and the processes that have shaped
them. We also discuss the state of the art in terms of experimental techniques
and numerical simulations that are currently being used to investigate regolith
processes occurring on small-body surfaces and that are contributing to the
interpretation of observations and the design of future space missions.
