Earth system deals with the relations between the Earth’s Spheres- atmosphere, hydrosphere, cryosphere, geosphere, pedosphere, biosphere as well as magnetosphere and the influence of human societies on these components. To understand the photosynthesis and respiration, the hydrologic, carbon and nitrogen cycles, you need to study this Basic Concepts Of The Earth System for earth’s ecological system. See More: https://bit.ly/2YBIGIc