QUESTION:
Is there quicksand on Mars?

ANSWER from Jeff Plescia on January 31, 1997:
Probably not. Quicksand is a loose mixture of water and sand.
There is no liquid water at the surface of Mars; the atmospheric
pressure is too low and it is too cold. So while there might
be areas filled with sand, you would not sink out of sight if
you tried to cross them.

Jeff Plescia