Systems Flashcards
Define System
A set of linked components which work together
Define Inputs
The energy or material which is added to the system
Define Outputs
The energy or material which leaves the system
Define Energy
This powers the system and so makes it work
Define Stores/Components
The individual parts of the system where energy or material is either stored (kept) or transformed (changed) by processes
Define Flows/Transfers
The links between different parts (called stores/components) of the system
Define processes
The transformation of components by natural or human activities.
Define Positive Feedback
A sequence of events that amplifies or increases change.
It is likely to promote environmental instability or change
Define Negative Feedback
A sequence of events that damps down or neutralises change. It is likely to promote environmental stability and so less change
Define dynamic equilibrium
The system is in balance. Inputs and outputs are stable.
Define Isolated System
They are a theoretical concept and not in the real world. There are no inputs or outputs of energy or materials.
Example: research labs.
Define Closed System
The system is self-contained where the output goes back into the system as an input. There inputs of energy (solar energy for the earth) and outputs of energy (solar radiation), but no transfer of material or matter (the earth as it has finite resources)
Example: The Earth
Define Open System
Most systems are open except on a global scale. There are inputs and outputs of both energy and materials
Examples: systems in physical geography such as in the water cycle, in the carbon cycle, in the coastal system.
