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Inputs
Matter/energy is added to the system
Outputs
Matter/energy leaves the system
Stores
Matter/energy builds up in the system
Flows
Matter/energy moves in the system
Boundaries
Limits to the system
Open system
System receives inputs and transfers outputs of energy and matter
Closed system
Only energy can cross the boundary, matter is contained
Dynamic equilibrium
System where inputs and outputs are balanced
Positive feedback
Chain of events amplifying the impact of the original event
Negative feedback
Chain of events nullifying the impacts of the original event
Examples of positive feedback water cycle
Increased evaporation turns into a greenhouse gas that traps heat and further increases evaporation
Examples of negative feedback in the water cycle
Increased cloud formation from evaporation reflects solar radiation and causes cooling
Examples of positive feedback carbon cycle
Permafrost melt, Wildfires, Oceanic warming
Examples of negative feedback carbon cycle
Increased plant growth, longer growing seasons