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Chalk, coal and some limestone are sedimentary rocks formed:

AOrganically
BMechanically
CChemically
DThermally
Answer & Solution
Correct answer: A. Organically
1. Sandstone and shale form mechanically. 2. Chalk and coal form organically. 3. Chert and halite form chemically. _Source: syllabus Fundamentals of Physical Geography, Chapter 5, Minerals and Rocks._
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