Question 13

non-clastic sedimentary rocks have grains derived from

ancient organisms

chemical precipitates

either of the above

Chemical precipitates

Explanation:

Non-clastic sedimentary rocks are the product of chemical reactions. This is not the case with clastic sedimentary rocks as these are produced by erosion.

Non-clastic rocks such as limestone are made up mostly of the calcite-rich skeletons of marine organisms. Other non-clastic rocks are formed from the precipitation of minerals in supersaturated water.  

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