The study of the atmosphere and the processes that produceweather and climate is. 11. The science of is the study of the universe. Formation of Earth 12. The hypothesis suggests that the bodiesof our solar system evolved from an enormous rotating cloudcalled the solar nebula.
Definition of selfâpurification. 1  1 : purification by natural process selfâpurification of water. 2  2 : purification of oneself.
Sampling station 2 was selected in order to possibly distinguish the self-purification ability of the canal tract bordered by beaten soil from that framed by concrete. Sampling station 3 was chosen to detect the influence of a siphon along the course of the canal enabling the crossing of the river Zero.he water environment reacts to the input of polluting substances by means of a number of mechanisms aiming to restore its original conditions. This process, referred to as self-purification, actually consists of a recycling of materials (Vismara, 1998).