Crossword Clue:

RILLE a valley on the moons surface

AnswerCrossword Clue
RHUMBCurve on the surface of a sphere
FLOTSAMRefuse on the surface
DUSTIt looks bad on the surface
NEILARMSTRONGFigure seen on the lunar surface
BERGOn the surface it might not look like much
GREENALGAEGrowth on wet rocks or the surface of stagnant water
ASIALocale of both the highest and lowest points on the earth's surface