Which one of the following sedimentary rocks are organically formed?

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Q: (NDA-II/2019)

Which one of the following sedimentary rocks are organically formed?

question_subject: 

Geography

question_exam: 

NDA-II

stats: 

0,18,28,22,4,2,18

keywords: 

{'sedimentary rocks': [1, 0, 3, 1], 'shale': [1, 0, 0, 0], 'chalk': [0, 0, 0, 3], 'halite': [0, 0, 0, 2]}