 Not only did The chemical composition and its consequences for the crust and mantle provided a linkage in chemical composition between subducting ocean sediment and the composition of lava from arc volcanoes, but also it called for a development of a global subducting sediment (GLOSS) composition and flux similar to upper continental crust (UCC).Plank has since updated GLOSS to GLOSS-II in her 2014 publication, "Chemical composition of subducting sediments.