1) Compaction 2) Compression 3) Concentration 4) Concretion 1) Compaction 2) Compression 
(from the article `advanced ceramics`) Densification...in the ice grains. This causes a general rounding of the tiny ice grains so that they fit more closely together. In addition, the wind may break ... [2 related articles]
A mechanical process to compress biomass (usually wood waste) into pellets, briquettes, cubes, or densified logs. ... (05 Dec 1998) ...