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Reproductive problems illustrate



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Reading passages

Reproductive problems illustrate .
A)that cheetahs don't have a variation in their genetic structure 
B)that the amount of infant mortality is excessive 
C)cheetah is threatened by extinction 
D)cheetah's vulnerability to disease 
E) loss of their natural habitat leads them to extinction 


 
 
251 
When it was formed millions years ago the earth was a liquid. It is s having the process of 
cooling and many miles below the hard crust is s hot. However, in some places the heat is 
closer to the crust. These places 

associated with volcanic activity or hot sulphur springs. 
Drilling deep ir the earth's crust we can reach rocks that are much warmer than those at t. 
surface. Pumping water down into contact with these rocks and extracting tl steam so 
produced is a source of energy that can be used to produi electricity. It is called 
geothermal energy. 
 
58. It is explained in the passage that under the hard surface of th earth, 
there________.
A)exists a hot core which can be used as energy 
B)is a hot liquid layer which has never been drilled 
C)seems to be a great deal of volcanic activity which threatens life 
D)could be a number of hot sulphur springs, the main cause o: volcanic activity. 
E) has never been sufficient heat to melt rocks 
 
59. According to the passage, gjgothermal energy 
.
A)can be produced both plentifully and cheaply 
B)has been used by man for millions of years 
C)is a bi-product of extensive volcanic activity 
D)is obtained from the contact of water with the hot rocks below the earth's surface 
E) is recognised as the only form of energy that will never be used up 
60. We can inter from the passage that the earth's crust .
A)has completely stopped the process of cooling underneath 
B)is a constant source of energy 
C)is not suitable for drilling 
D)is constantly warming and cooling due to volcanic activities, 
E) varies in thickness from place to place 
When we turn to the problem of fishing, we see that through a II Convention on the Law 
of the Sea, the world's countries have indicated th; they recognize the risks of over-
fishing. Nations can now declare 200 mi! exclusive economic areas and exclusive fishing 
areas and control the catch , a level that is reasonable. Developing nations seem to be 
beginning to benel from the new fisheries regime which offers the promise of allowing 
them i manage fishing resources for optimum, that is long-term, benefits. 

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