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My Chickens , Ducks , Geese , and even the Guinea all cover the egg's with sand and less then an inch and the air will circulate between the grains of sand as it is loose and soft for the most part and sand is really small bits of rock unlike dirt that can seal and yes I have had chicken egg's hatch out there in the yard with out a mother hen brooding them so I know it works but at my age and health it is kind of funny chasing 1 day old chicks around the yard ...
The direct sun will cook the egg's and some 30 years ago when I was stationed two hours from here at Ft. Irwin some time people would crack open an egg and cook it on the fenders of the tanks to show the new guys how hot it really is in the desert and around metal objects and yes the egg would fully cook in just a couple of minutes ......