Terminology. Many authors prefer the term annular fissure over annular tear, as the latter seems to imply acute injury 1,2. In the setting of severe trauma with disruption of the disc, then the term disc rupture should be used. The term annular gap (referring to a relatively wide annular fissure) is non-standard 2.any authors prefer the term annular fissure over annular tear, as the latter seems to imply acute injury 1,2. In the setting of severe trauma with disruption of the disc, then the term disc rupture should be used.
Sedimentary rocks tend to be more porous than igneous rocks because there is more open space between the individual sediment grains than between the minerals in a crystallized â¦ rock.Porosity of rocks  Consolidated rocks (e.g. sandstone, shale, granite or limestone) potentially have more complex dual porosities, as compared with alluvial sediment.
Sedimentary rocks are the result of the weathering process on earth. Most sedimentary rocks are composed of fragments or particles which strongly resemble sediments. Most are formed by the compaction and cementing of sediments.These sediments are deposited in the oceans and usually have parallel layers.These layers are very helpful in identifying sedimentary rocks. Some other characteristics that sedimentary rocks have are rounded particle, fossils and a dull (earthy) appearance.hemical sedimentary rocks-are formed from the evaporation of seawater or chemical activity. They are also called evaporties. The particles or minerals that form these rocks precipitate (settle) to the bottom of the ocean. Rock salt is the most common chemical sedimentary rock.