Boulder to Sand
Country: United States
Date: May 2007
How long does it take a boulder to become sand? My second
grader asked this question when we were discussing why sand looks
like small rocks.
The answer is - - it depends. It depends on what the boulder was made
of and what the climate is like.
Some rocks, like Granite break down quite quickly in wet climates,
especially if there is freezing and thawing every so often. Metamorphic
rocks like slate and gneiss last longer.
Oklahoma State University
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Update: June 2012