soil or rock definitions

From: Maruyama, Takashi <tvm_at_SLAC.Stanford.EDU>
Date: Tue, 5 Feb 2013 10:28:12 -0800

2013 19:28:24 +0100 (CET)
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This must be already discussed, but how can I define "soil" or "rock"? There are all kinds of soil/rock so how about "granite"?

   Takashi Maruyama
   SLAC
Received on Wed Feb 06 2013 - 09:23:03 CET