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Question
The major constituent in silicious rocks is- 
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A.
lime
B.
silica
C.
clay
D.
slates
Answer ( Option B)

silica

Solution

Siliceous rocks are sedimentary rocks that have silica (SiO2) as the principal constituent. The most common siliceous rock is chert and other types include diatomite. They commonly form from silica- secreting organisms such as radiolarians, diatoms, or some types of sponges. 

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