What is the 'fine fuel moisture of extinction' and why is it critical in burn planning?
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A
The moisture content above which fine fuels will not sustain combustion, used to set upper prescription limits
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B
The moisture level at which fine fuels ignite most easily, used as the target ignition condition
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C
The moisture threshold at which only aerial ignition is effective
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D
The moisture content below which backing fires are no longer controllable