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PDF - Wallace Online

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THE CLIMATE AND PHYSICAL ASPECTS OF THE EQUATORIALZONEThe three Climatal Zones of the Earth Temperature of the EquatorialZone Causes of the Uniform High Temperature near the EquatorInfluence of the Heat of the Soil Influence of the Aqueous Vapourof the Atmosphere Influence of Winds on the Temperature of theEquator Heat due to the Condensation of Atmospheric VapourGeneral features of the Equatorial Climate Uniformity of the EquatorialClimate in all parts of the Globe Effects of Vegetation onClimate Short Twilight of the Equatorial Zone The aspect of theEquatorial Heavens Intensity of Meteorological Phenomena at theEquator Concluding Remarks.IT is difficult for an inhabitant of our temperate land torealise either the sudden and violent contrasts of the arcticseasons or the wonderful uniformity of the equatorial climate.The lengthening or the shortening days, the ever- changingtints of spring, summer, and autumn, succeeded by the leaflessboughs of winter, are constantly recurring phenomena whichrepresent to us the established course of nature. At theequator none of these changes occur there is a; perpetualequinox and a perpetual summer, and were it not for variationsin the quantity of rain, in the direction and strength of thewinds, and in the amount of sunshine, accompanied by correspondingslight changes in the development of vegetable andanimal the life, monotony of nature would be extreme.In the present chapter it is proposed to describe the chiefpeculiarities which distinguish the equatorial from the temperateclimate, and to explain the causes of the differencebetween them, causes which are by no means of so simple anature as are usually imagined.

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