. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. Weather Study 867 toward the northwest, hence the name Southeast Trade Winds. The dividing Hne, or bank, between the rivers in each hemisphere belts the earth at about 35° north and 30° south of the equator. Why does the air move and why does it move in such a regular, systematic manner ? To answer these questions we will rely upon gravity, the heat from the sun and the effect of the rotation of the earth on moving wind currents. Everyone knows that water flows down hill because of th
. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. Weather Study 867 toward the northwest, hence the name Southeast Trade Winds. The dividing Hne, or bank, between the rivers in each hemisphere belts the earth at about 35° north and 30° south of the equator. Why does the air move and why does it move in such a regular, systematic manner ? To answer these questions we will rely upon gravity, the heat from the sun and the effect of the rotation of the earth on moving wind currents. Everyone knows that water flows down hill because of the force of gravity. Gravity is nature's great peacemaker. It is always trying to settle disturbances, even things up, smooth them over. If there were no winds to bring rain to the land or to stir up the ocean, gravity would. WINDS OF THE WORLD soon run all the water into the lakes and the seas, and then smooth them out like sheets of glass; and if there were nothing to stir up the winds, gravity would soon settle all differences in the atmosphere and the air would become perfectly quiet. So gravity is kept busy trying to smooth out the water which the wind stirs up, at the same time trying to quiet the winds which are stirred up by the heat of the sun. Tyndall says that heat is a mode of motion, that when heat is imparted to a substance the molecules of which it is composed are set into very rapid vibration. They are continually trying to get away from each other and usually succeed in getting more space, and thus increase the size or volume of the substance, or, in other words, expand it. Iron, brass, copper, water and many other substances expand under heat. Air is a gas and expands very rapidly when heated. One cubic foot of cold air becomes two cubic feet when heated. Now gravity pulls things down toward the center of the earth in accordance with their weight-density, and a cubic foot of cold air, being more dense and thus heavier than an equal volume of warm air, is pull
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