  We report on craters formed by balls dropped into dry, non-cohesive, granular
media. By explicit variation of ball density $\rho_{b}$, diameter $D_{b}$, and
drop height $H$, the crater diameter is confirmed to scale as the 1/4 power of
the energy of the ball at impact:
  $D_{c}\sim(\rho_{b}{D_{b}}^{3}H)^{1/4}$. Against expectation, a different
scaling law is discovered for the crater depth:
  $d\sim({\rho_{b}}^{3/2}{D_{b}}^{2}H)^{1/3}$. The scaling with properties of
the medium is also established. The crater depth has significance for granular
mechanics in that it relates to the stopping force on the ball.
