The physiography of the river Nile and is basin . rect influenceupon the river. Climate.—In the high pressure zone situated 30^ to 35° north andsouth of the equator, there is a gradual settling down of the atmospheretowards the earths surface, and its humidity becomes gradually less,until the air reaches the earths surface warm and dry. In its sub-sequent passage over the 20° of latitude of the hot trade wind belts,it takes up moisture and carries it forward into the equatorial calm-belt, a region of low atmospheric pressure. Here it is carried up bythe ascending air currents, and its moisture
The physiography of the river Nile and is basin . rect influenceupon the river. Climate.—In the high pressure zone situated 30^ to 35° north andsouth of the equator, there is a gradual settling down of the atmospheretowards the earths surface, and its humidity becomes gradually less,until the air reaches the earths surface warm and dry. In its sub-sequent passage over the 20° of latitude of the hot trade wind belts,it takes up moisture and carries it forward into the equatorial calm-belt, a region of low atmospheric pressure. Here it is carried up bythe ascending air currents, and its moisture is condensed into clouds andrain. Thus it is that the equatorial calm-belt is also a cloud-and rain-belt, being su])plied with the necessary moisture by the north-east andsouth-east trade winds. The rain-belt is wider and less defined thanthe calm-belt, since the air currents flow outwards as theygradually expand and diverge from the central line of the calm-belt. Ball. Geol. <if Aswan Cataract, in tho press. AUGUST PLATE - 25 2S - 50 SO - too 100 - »oo 200 - aoo bovo 300 1 Survey Hept. Cairo MEAN MONTHLY RAINFALL
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