Systems Flashcards
Define a system
An assemblage of interrelated parts that work together by way of some driving force
Why are systems used
Systems are a particularly useful type of model, which simplify complex things to facilitate understanding.
What are the three types of system?
Give an example of each
Open - A Drainage Basin
Closed - Sediment Cell
Isolated - The Universe
Define an Open System
A system in which both matter and energy can enter and leave the system across the system boundary.
Define a Closed System
A system which has minimal interactions with things outside of the system i.e. matter cannot leave or enter the system, however, energy may seep through
Define an Isolated System
One which does not interact with the outside world in any way. Matter and energy remain confined to the system, and none extra can be added.
What is Dynamic Equilibrium?
When the inputs and outputs of a system are balanced
What is feedback?
When the amount of a substance input or output suddenly changes, upsetting the equilibrium and affecting the contents of the stores
What are the 6 key components of a system?
Inputs Processes Elements System Boundary Stores Outputs
What are attributes?
The characteristic of system elements
What is the difference between positive and negative feedback?
Positive feedback is where an outside action amplifies the processes within the system, whereas in negative feedback, the outside action diminishes the processes.
The Earth as a whole is a closed system, but within it are 5 subsystems. What are they and what do they govern?
Atmosphere - Air and gasses Lithosphere - Tectonics and Rock Hydrosphere - Water Cryosphere - Natural Ice Biosphere - Organic Life
What is the relationship between the 5 subsystems known as?
A cascading system
Give an example of the 5 subsystems interacting
LS: Volcanic eruption releases greenhouse gases AS: Global air temperatures rise HS: Rainfall increases CS: Ice melt increases BS: Plants grow and erode soil
