ABSTRACT
The term system comes from Greek and means "whole concept made of several parts". It can be defined as a regularly interacting group of items forming a unified whole. The importance of a systematic approach in science, and specifically in geochemistry, was emphasized by Vernadsky who thought it impossible to divide natural phenomena into independent parts without doing harm to the resultant conclusion. In other words, the features of an earlier sedimentation should be reflected in geochemistry of geological bodies formed later. In hypergenic conditions, many geochemical systems are characterized by high dispersity of the solid phase. These include clay rocks of weathering crusts, soils, silt, and bottom sediments. The Earth's crust receives energy from two sources: from the cosmos and from the Earth's interior. When merged in the crust, these two oppositely directed flows create a complex thermodynamic situation.
