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Thread: Small airports, big security hassles
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Old 8th February 2012 | 08:34
  #8 (permalink)  
handsfree
 
Joined: Jun 2006
Posts: 216
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From: EGNX country
Oh well, here goes :-

256 mm diameter : Boulder
64 to 256 mm dia : Cobble
4 to 64 mm dia : Pebble
2 to 4 mm dia : Gravel
1/16 to 2 mm dia : Sand
1/256 to 1/16 mm : Silt
1/256 : Clay

Sediment Description
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