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.
SELF PURIFICATION OF NATURAL STREAMS. The self purification of natural water systems is a complex process that often involves. physical, chemical, and biological processes working simultaneously. The amount of. dissolved Oxygen (DO) in water is one of the most commonly used indicators of a river. health.