what+is+substrate

The material that organisms live in,on, or around. Substrate is made of organic and inorganic particles.
In a stream this could be mud, sand, granular, pebble, cobble, and boulder.


 * Mud – silt and clay.
 * Sand – Particles between 0.06 and 2 mm in diameter.
 * Granular – Rock between 2 and 4 mm in diameter.
 * Pebble – Rock between 4 – 64 mm in diameter.
 * Cobble – Rock between 6.4 and 25.6 cm in diameter
 * Boulder – Rock more than 25.6 cm in diameter.[[image:Photot7.jpg width="465" height="343" align="center"]]

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