A: Styrofoam does not decompose in the environment under normal circumstances. Much like plastic, Styrofoam is made from a polystyrene-based petroleum product that is not biodegradable. Plastic takes hundreds of years to decompose, and Styrofoam takes much longer because it is a stronger form of plastic.
View Full Document. Zone of wastage: Is the area in which melting or ablation rates exceed those of snowfall (Fig.2). â¢ The snow line: Is the boundary between the zone of accumulation and that of wastage, and could therefore be defined as the highest level at which winter snow melts in the summer. VI- Internal structure of a glacier.
The fundamental biostratigraphic unit is the biozone. The range zone is defined by the geologic range (the total time of existence) of a particular fossil group or species. For example the range zone of the fossil graptolites is Ordivician to Devonian. A concurrent range zone is the overlapping range zones of two or more fossils with different geologic ranges.