. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. 874 Handbook of Nature-Study unequal distance of the tropical belts of high pressure from the equator. These questions may be considered together. It is to be remembered that the southern hemisphere is the water hemi- sphere, and that the prevaihng westerhes, in ghding over the smooth water surface, are but Httle retarded by friction and, therefore, attain a higher velocity than the corresponding winds of the northern hemisphere, where the rougher surface materially retards their move
. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. 874 Handbook of Nature-Study unequal distance of the tropical belts of high pressure from the equator. These questions may be considered together. It is to be remembered that the southern hemisphere is the water hemi- sphere, and that the prevaihng westerhes, in ghding over the smooth water surface, are but Httle retarded by friction and, therefore, attain a higher velocity than the corresponding winds of the northern hemisphere, where the rougher surface materially retards their movement. As a consequence, the circumpolar whirl of the southern hemisphere is stronger, and develops a greater centrifugal force, thus holding a larger quantity of air away from the south pole and reducing the pressure to a greater degree than is brought about by the weaker winds of the northern hemisphere. Since the circumpolar whirl of the southern hemisphere is the stronger of the two, it withdraws the air to a greater distance from the pole than does its weaker counterpart of the northern hemisphere, and piles it up in the tropical belt of high pressure about five degrees nearer the equator than does the weaker forces of the northern hemisphere. Storms Having gained a comprehensive view of the general, planetary wind system, we may now undertake the study of local disturbances that arise within the general circulation and are known as "; Storms are simply eddies in the atmosphere. They may be compared to the eddies that are often seen floating along with the current of a river or creek. In these eddies the water is seen to move rapidly around a central vertex, developing sufficient centrifugal force to hold Snow crystal. some of the water away from the center, thus Photomicrograph by forming a wcU marked depression, frequently w. A. Bentiey. of Considerable depth. The whole circulation of the eddy is quite independent of the current of the stream which carrie
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