|
Boulders:
greater
than 10 inches (25.6 cm)
|
|
Cobbles:
3-10
inches (6.4 - 25.6 cm)
|
|
Pebbles:
1/10th
- 3 inches (0.2 - 6.4 cm)
|
|
Sand: 0.006
- 0.2 cm (2mm - .06mm) visible grains
|
|
Silt: 0.0004
- 0.006 cm (.06 - .004mm)grains felt but not visible
|
|
Clay: less
than 0.0004cm (.oo4mm) surface feels slippery
|
|
Dissolved
minerals - no grains - the chemicals are in solution
in the stream or groundwater
|
|
Cements
- precipitated minerals between grains - usually clay
to silt sized
|
