Geographical Information System. A database of information which is geographically orientated, usually with an associated visualisation system.
From a glacier and the formations/sediments they make.
Beach material, coarser than sand but finer than pebbles (2-4 mm diameter). Note that 'gravel' beaches commonly contain material in range from 2-256mm.
Narrow, roughly shore-normal structure built to reduce longshore currents and/or to trap and retain beach material. Most groynes are of timber or rock and extend from a seawall or the backshore well onto the foreshore and rarely even further offshore.