Introduction
In the concept of earth science, the pathway through, which chemical substances or materials move through abiotic or biotic process is referred as bio-geochemical cycle (Lerner, 2009). Biotic component of the bio-geochemical cycle is the biosphere, which basically supports various aspects of life. On the other hand, the abiotic component is made up of the lithosphere, hydrosphere and the atmosphere, which support life indirectly (Lerner, 2009). In addition, the bio-geochemical cycle is made of various chemical cycles which include: The water cycle, oxygen cycle, carbon cycle, phosphorous cycle, nitrogen and the sulphur cycle. These cycles are also composed of Continue reading...