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Q.

Which of the following rocks is different from the remaining three on the basis of its mode of origin?


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a

Limestone

b

Sandstone

c

Shale

d

Marble 

answer is D.

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Detailed Solution

Marble is different from the rest of the rocks.
Marble is a kind of metamorphic rock. The metamorphism of sedimentary carbonate rocks, most frequently limestone or dolomite, produces the rock known as marble (rock). The initial carbonate mineral grains undergo varied recrystallization due to metamorphism. Carbonate crystals form an interconnecting mosaic to form the marble rock that results. Since the rest of the options are sedimentary rocks and marble is the only metamorphic rock, this is the correct option.
 
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