Taxonomy is the science of classifying organisms. The system currently used by taxonomists is called the Linnaean taxonomic system, in honor of Swedish biologist Carolus Linnaeus (1707 â 1778). The Linnaean system breaks down organisms into seven major divisions, called taxa (singular: taxon).
Generally speaking, the wall measures about 23 to 26 feet tall. The fracture surface of the wall is ladder type with the base measuring about 7.1 yards wide and the top measuring 6.3 yards wide on average, which makes it firm and very unlikely to collapse.
Install retaining wall step-up. 1  When building step-ups, begin the base course at the lowest wall elevation. 2  Dig a base trench that is 24 in. ( 3 600 mm) wide.**. 4  The depth of the trench is determined by allowing for 6 in. ( 5 150 mm) plus an additional 1 in. The depth of the trench is determined by allowing for 6 in. ( 2 150 mm) plus an additional 1 in. ( 3 25mm) for each 1 ft. (300 mm) of wall height for the amount or buried block that is needed. 4  The trench also needs to extend into the slope far enough to bury one full block.**.