speaking of cold weather.......

Inspired by this talk of frost and permafrost and impermafrost, can someone form less moderate climes than mine tell me the difference between air-frost and ground-frost? We occasionally get to -3/-5C, when we will have a pleasant coating of frost on the ground, quite exciting. Only in exposed bits though, under trees and such isn't usually effected.
I've always wondered if it is ground or air frost.
Margaret, in warm and very dry SW Australia.
 
 
Margaret and Peter Moir
Olive Hill Farm
Margaret River, Western Australia.
     www.wn.com.au/olivehill
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