. Europe and other continents . n-daries of the heat belts are also irregular, as is shownby the isotherms 1 on the isothermal charts of the world. If nothing else influenced temperature excepting dis-tance from the equator, the isothermal lines would beparallel to the circles of latitude. In our study of NorthAmerica, however, we have already learned that thetemperature of a country is determined by several factorsbesides latitude. These are (1) altitude; (2) the nearnessto a large body of water ; (3) the direction of the prevailingwinds; and (4) ocean currents. Let us see how eachof these ca
. Europe and other continents . n-daries of the heat belts are also irregular, as is shownby the isotherms 1 on the isothermal charts of the world. If nothing else influenced temperature excepting dis-tance from the equator, the isothermal lines would beparallel to the circles of latitude. In our study of NorthAmerica, however, we have already learned that thetemperature of a country is determined by several factorsbesides latitude. These are (1) altitude; (2) the nearnessto a large body of water ; (3) the direction of the prevailingwinds; and (4) ocean currents. Let us see how eachof these causes interferes with the regularity of the iso-therms. Effect of Highlands. — Mountains are colder in bothsummer and winter than low lands in the same , in crossing mountain chains the isotherms bendtoward the equator. Our small maps do not show this. Effect of Distance from Sea. — Comparing Figures 36 and 1 An isotherm is a line connecting places having the same averagetemperature. 41 42 GENERAL GEOGRAPHY. DISTRIBUTION OF TEMPERATURE 43
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