Systems

• Earth systems


  Different concepts that work together as part of an overall mechanism; a complete whole.
• Elements of a system

  Input, store, transfer, output, energy, boundary
• Input


  Energy moving from one store to another
• Transfer

  Removing energy from a system
• Output

  A part where energy is stored
• Energy


  The ability of something to make things happen
• Boundary

  The edge of the system
• Open systems

  Matter and energy can be transferred from the system across the boundary to surrounding.
• Closed systems

  Transfers of energy both into and beyond the system boundary but not transfer of matter.
• Isolated systems

  Have no interactions with anything outside the boundary.
• Dynamic equilibrium

  A balanced between inputs and outputs.
• Positive feedback


  Amplify change and lead to a repetition of the cycle but does not go back to normal eg. Warming of the eartg
• Negative feedback

  Counter the initial change normally leading to the conditions found before the initial change eg. Greenhouse effect