. Elementary physical geography;. THE TIDE WAVE: MOON IN OPPOSITION tract the earth. The solid portion of the earth does notperceptibly bend or yield, because it is rigid; the waterenvelope, on the contrary, is drawn into the elongatedform (Appendix, Table VI), giving the appearance of twowave-crests, one on each side of the earth. No matterwhether the sun and the moon are on the same side, or on. THE TIDE: MOON IN QUADRATURE 202 PHYSICAL GEOGRAPHY opposite sides, their combined attraction will produce thesame results. If, however, they pull at right angles,four tide waves will be formed—two o
. Elementary physical geography;. THE TIDE WAVE: MOON IN OPPOSITION tract the earth. The solid portion of the earth does notperceptibly bend or yield, because it is rigid; the waterenvelope, on the contrary, is drawn into the elongatedform (Appendix, Table VI), giving the appearance of twowave-crests, one on each side of the earth. No matterwhether the sun and the moon are on the same side, or on. THE TIDE: MOON IN QUADRATURE 202 PHYSICAL GEOGRAPHY opposite sides, their combined attraction will produce thesame results. If, however, they pull at right angles,four tide waves will be formed—two of the sun and twoof the moon. In much of the Northern Hemisphere, where the con-tinents interrupt the tide waves, the solar tides arc merg< x 1 into those of the in the broaderexpanses of the ocean,among the islands ofthe South Pacific, arethey new and full moon,the pull is exerted in astraight line; the tides are then materially higher at floodand lower at ebb than when the two are pulling at rightangles. The former are spring tides; the latter neap the moon revolves around the earth, the waves aredragged after it as though they were fastened to it. Eachwave makes the circuit in about twenty-eight days. But while each wave is making its revolution, the earthat the same time is turning on its axis, every twenty-four hours. The daily motion of the
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