inputs, processes and outputs of energy but not matter (e.g global hydrological cycle)
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what is an open system
inputs, processes, outputs of both energy and matter (e.g drainage basin system)
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what is an isolated system
no inputs of energy or matter
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how does a system remain balanced
when inputs and outputs = balanced -> state of dynamic equilibrium (known as the norm)
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what happens if something happens to upset the balance in a system
the system has a corrective mechanism to restore the system to the norm (e.g rainfall increases, river will enlarge channel to allow to cope with extra water)
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what triggers positive feedback to occur
floods, due to the systems ability to adjust to change too severely or suddenly
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what is a dra
an area of highland drained by a river and all of its tributaries
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