CHAPTER V. 



DUST-MAKERS AND DUST-CARRIERS - GLACIERS AND 

 ICEBERGS. 



Floating Ice Glaciers : the Loads they Carry, their Tools, how they Cut, 

 Scratch, and Polish Stone-meal Fjords Engraved by Glaciers 

 Glaciers in England Glacial Dust-heaps When the Great Thaw 

 came Icebergs as Dust-carriers The great Distances they Travel. 



UNNING water, as we have seen, can do much in the 

 -T\. way of wearing down rocks, and transporting heavy 

 loads ; but frozen water can do still more, and a river filled 

 with miniature icebergs, or broken sheets of ice, possesses 

 tremendous powers of destruction. 



When the ice broke up on the Danube a few springs ago, 

 such great masses were hurried along by the tumultuous, 

 swollen waters, and were hurled with such terrific force 

 against anything that came in their way, that the closed gates 

 of a canal were burst open, and a solid wall of masonry, 

 seven feet thick and 2 50 feet long, was speedily and entirely 

 overthrown. 



Ice being lighter than water, is easily borne along, even 

 by a feeble current, and although when loaded with sand, 

 pebbles, and bits of rock, it may be too heavy to be carried 

 on the surface, it will still float down the stream without 

 difficulty. 



When the ice breaks up on the St. Lawrence, the huge 



