Definition: A piece of rock with a grain size above 300 millimetres in diameter. Smaller boulders are, at times, referred to as rocks or stones. [ https://en.wikipedia.org/wiki/Boulder]
Definition: Silt is granular material of a size somewhere between sand and clay whose mineral origin is quartz and feldspar. [ https://en.wikipedia.org/wiki/Silt ]
Definition: An area that is inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions.
Definition: A point where groundwater or steam flows out of the ground, and is thus where the aquifer surface meets the ground surface or where there is a fissure.
Definition: A habitat that is in or on a body of water containing low concentrations of dissolved salts and other total dissolved solids (<0.5 grams dissolved salts per litre).
