Posted by amie on Tuesday, September 29, 2009 at 6:32pm.
I would say "erosion" but look here:
http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla:en-US:official&hs=Ob7&ei=oZ3CSu_KEY3QlAfziN3YBA&sa=X&oi=spell&resnum=0&ct=result&cd=1&ved=0CAYQBSgA&q=wearing+down+rock+by+grounding+of+other+rocks+or+sand+is...&spell=1
Sra
its called weathering - we just did it in science. you get 3 types:
biological, physical and chemical weathering.
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