An automatic internal response to changes in a system
Negative feedback - the response reduces the change, bringing the system back to equilibrium
For example:
After removal of sediment during storm conditions, an offshore bar forms which reduces erosion and helps sediment return to the beach, restoring equilibrium
Positive feedback - the response amplifies the change, moving the system further away from equlibrium
For example:
If the sediment on a beach is transported away, the cliff is unprotected and therefore subject to increased erosion and more coastal retreat
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