Matter, Energy and Life

Three elements of matter, energy and life reinforce the concept that we all exist in an Earth-bound web that’s so intricately intertwined and interdependent that imbalances in one area can upset the dynamics of the entire system. 

Each element that is vital for life exists on Earth in a closed loop of cyclical changes.  From a systems point of view, Earth is essentially a closed system with respect to matter.  The functioning of our planet relies on a constant input of energy from the sun.  This energy leaves Earth in the form of heat flowing to outer space.  From a systems point of view, Earth is an open system with respect to energy.  A vast and intricate network of relationships connects all Earth's organisms with each other and with the cycles of matter and the flows of energy.  From a systems point of view, Earth is a networked system with respect to life.   

from Threes, Chapter 3, “Threes in Science”