The physiography of the river Nile and is basin . - 25 2S - 50 SO - too 100 - »oo 200 - aoo bovo 300 1 Survey Hept. Cairo MEAN MONTHLY RAINFALL. — 11 — As this condensation is constantly taking place in this equatorial belt,it follows that the greatest precipitation will be in the neighbourhoodof the centre of the belt, as it iHO\es northwards and southwards in itsannual oscillation, a change deterniined by the position of the sunat noon, since where it is in the zenith at noon, it will have the greatestheating effect, causing the ascensional movement of air above referredto. A place situ
The physiography of the river Nile and is basin . - 25 2S - 50 SO - too 100 - »oo 200 - aoo bovo 300 1 Survey Hept. Cairo MEAN MONTHLY RAINFALL. — 11 — As this condensation is constantly taking place in this equatorial belt,it follows that the greatest precipitation will be in the neighbourhoodof the centre of the belt, as it iHO\es northwards and southwards in itsannual oscillation, a change deterniined by the position of the sunat noon, since where it is in the zenith at noon, it will have the greatestheating effect, causing the ascensional movement of air above referredto. A place situated in the mean position of the belt will have itsheaviest rainfall in Ajiril and October, with minima in June andDecember, when the rain-belt centre is at the greatest distance northand south of it; if the rain-belt is narrow, dry seasons may even beexperienced at these months. Similarly a place situated to the northof the equator, within the limits of the oscillation of the rain-belt,will have a single rainy season in the summer of the northernhemisphere, followed !)}• a long dry season throughout the rest ofthe year. In the Nile basi
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