The determination for the modal age level for grades four and six for the difficulty of the principle: the principal cause of wind and of weather change is the unequal heating of different portions of the earth's surface by the sun: thus, all winds are convection currents caused by unequal heating of different portions of the earth's atmosphere, and they blow from places of high atmospheric pressure to places of low atmospheric pressure.
Kelley, Robert F
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Thesis (Ed.M.)--Boston University