. Elementary physical geography . any other part of the earths sur-face, the denser air moving in toward the warmer regioncauses currents. The equator may be fairly compared witha stove, over which air rises by convection, and toward whichcurrents flow. These inmoving winds are called the trades,because they blow with marked permanency and steadiness ;and in planning their journey, whenever possible, vesselschoose a course which will allow them to take advantage ofthe trade winds. These winds move toward the equator(see Plates 9, 10, and 11), but instead of blowing directlytoward it, they are
. Elementary physical geography . any other part of the earths sur-face, the denser air moving in toward the warmer regioncauses currents. The equator may be fairly compared witha stove, over which air rises by convection, and toward whichcurrents flow. These inmoving winds are called the trades,because they blow with marked permanency and steadiness ;and in planning their journey, whenever possible, vesselschoose a course which will allow them to take advantage ofthe trade winds. These winds move toward the equator(see Plates 9, 10, and 11), but instead of blowing directlytoward it, they are deflected by the effect of the earthsrotation. North of the equator their direction is from thenortheast, while south of it they move from the are much less well developed over the land than overthe water; and when they blow from the water to the land,they are often deflected because of its influence. Over theland they may even be destroyed. The air in the trade winds is moving from colder to 72 PHYSICAL Plate circulation of the Atlantic for July. GENERAL CIRCULATION OF THE ATMOSPHERE. 73 77Z7(rnZr?
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