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in joints and crevices of the rock forms a powerful



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in joints and crevices of the rock forms a powerful 
agent of disintegration. The action is the same as 
that which leads to burst pipes. Freezing causes 
expansion of the water in the spaces of a joint and 
produces a pressure sufficient to break the rock. 
277- The author points out that most true 
avalanches --------.
A) are considered to be falling rock not of snow or 
ice 
B) happen when the snow has started to melt 
C) take place when the snow has melted a little and 
then frozen hard again 
D) rarely leave behind them a bare rock surface 
E) cause considerable disintegration of the rock 
surfaces they come in contact with 
 
278- We can infer from the passage that during an 
avalanche --------
A) rock fragments are likely to be carried down 
with the falling snow 
B) the falling snow and ice start to melt very soon 
C) there is an absolute threat of life 
D) the failing snow is immediately followed by 
excessive rain 
E) failing snow banks up steeply against the nearest 
rock face 
279- The author states that the constant freezing 
and thawing of water in rock crevices --------.
A) is what causes an avalanche of snow and rocks 
B) is an unimportant detail for the avalanches 
C) produces a smooth rock surface 
D) causes a build-up of snow on the steep parts 
E) will cause the rock to break up 
 
Provided the term employment is used in its wider 
sense as meaning work which is of economic value 
not only to the family but to the community as 
well.
It might mean that women have at all times been 
thus employed. In primitive societies and in 
agricultural communities women shared in the 
productive work on the land, in the workplaces 

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