[doc30]

Just to clarify...dirt only came into existence after life.. and death. It's the result of the breakdown of formerly living things, mostly by currently living things.

Good point. That's why there is no dirt (a.k.a. soil) on the moon or on Mars. It's technically called regolith.

[Doctor Stochastic]

"Soil" (sort of by definition) requires some type of broken rock (sand, clay), organic matter (dead leaves, rats), air, and water. Lacking any of these, edaphologists (or soil scientists as dirt doctors are now called), don't call it soil.