Physical geography: Water and carbon cycles: Systems concept.

1. What is a closed system?

  • A system that transfers energy into and outside of the system boundary, does NOT transfer matter.
  • A system that transfers both energy and matter into and beyond the system boundary.
  • A system that transfers only matter into and beyond the system boundary.
  • A system that has interactions only outside of the system boundary.
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2. Define negative feedback.

  • Keeps a system in a state of dynamic equillibrium.
  • Decreases the level of change, by reducing soem of the inputs.
  • Increases the level of change, by increasing the inputs.
  • Leads to instability in the system.

3. identify one incorrect charcteristic of systems

  • Different parts of the system are connected and intergrated together.
  • Systems are a generalisation of reality- give an idea of what is happening in a system, but the reality is more detailed.
  • Systems accuratley show the reality of what is happening in systems.
  • Only SOME systems exchange energy/matter beyond their defined boundary.

4. What is a open system ?

  • Systems that have external inputs and & outputs of energy & matter.
  • A system that does not transfer any material.
  • A system that transfers only energy.
  • A system that transfers only matter.

5. Define dynamic equillibrium

  • The inputs are not level to the outputs in the system.
  • The state of balance in a system, where both the level of inputs and outputs are equal.
  • The level of inputs and outputs are not equal.
  • When the system is not in a state of balance.

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