B83-
1 .Describe the major component of magma?
2 .A common parental magma如何產生各種不同的岩石?
3 .Define the following terms：
(1)texture
(2)differentiation
(3)phase rule
(4)alkali-line index
(5)pyroclastic rocks
4 .Define the following rocks：
(1)andesite
(2)gabbro
(3)nephelinite
(4)peridotite
(5)rhyolite
5 .What will be the final products after several weathering of granites?
6 .State the parameters generally used for the classification of sandstone?
7 .What is the most voluminous sedimentary rock？Why?
8 .Define metamorphism?
9 .State the concept of metamorphic facies?
10 .Metamorphic rocks generally have a simple mineral assemblage, say, less than 5 mineral species, why?
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