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.
Clastic sedimentary rocks are composed of silicate minerals and rock fragments that were transported by moving fluids (as bed load, suspended load, or by sediment gravity flows) and were deposited when these fluids came to rest.lastic sediment, and thus clastic sedimentary rocks, are subdivided according to the dominant particle size (diameter). Most geologists use the Udden-Wentworth grain size scale and divide unconsolidated sediment into three fractions: gravel sand (1/16 to 2 mm diameter), and mud (clay silt is between 1/16 and 1/256 mm).