About The Earth as a System

About The Earth as a System

Blue Marble Earth

The first “blue marble” photo, taken in 1972 by Apollo astronauts at a distance of about 45,000 kilometers (28,000 miles) and one of the most reproduced images in human history, showcased for the first time our home planet.  While Earth is also nested within much larger systems, like our Solar System and Milky Way Galaxy, Earth is also made up of five major parts or subsystems: the Atmosphere, Hydrosphere, Biosphere, Cryosphere, and Geosphere. Each major part is connected to the other parts in a complex web of processes.

 

Definitions of the Spheres