THE CAUSE OF TIDES 



The tides of the sea are due to the pull of the moon, and, in lesser degree, of the sun. The whole earth is pulled by the moon, but tbt 

 loose and mobile water is more free to obey this pull than is the solid earth, although small tides are also caused in the earth'* solid crust 

 The effect which the tides have on slowing down the rotation of the earth is explained in the text. 



Photo: G. Brocklehursl. 



THE AEGIR ON THE TRENT 



An exceptionally smooth formation due to perfect weather conditions. The wall-hke formation of these tuU " 

 also) will be noticed. The reason for this is that the downward current in the river heads the sea-water ^k and 

 gerate the advancing slope of the,wave. The exceptional spring tides are caused by the combuied operat.o 



as is explained in the text. 



