Physical geography: Water and carbon cycles: Systems concept.

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1. 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.
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2. What is an isolated system?

  • A system that transfers both energy and material.
  • A system that has interactions outside of the system boundary.
  • They have no interaction with anything outside of the interaction boundary. No input of energy or matter.
  • A system that is closed.

3. Define positive feedback.

  • The effect of a change does not influence the processes in the system.
  • Enhances and effect, which has an impact on the process- leading to a "SNOWBALL EFFECT."
  • The inputs and outputs of the system are reduced by one change, which further reduces the inputs into the system.
  • The inputs and outputs of a systems are made level.

4. Define dynamic equillibrium

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

5. What is a closed system?

  • A system that transfers only matter into and beyond the system boundary.
  • A system that has interactions only outside of the system boundary.
  • 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.

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