Question

how are organic sedimentary rocks formed​

Answer 1

Organic sedimentary rocks are formed by lithification of organic debris like plants and remains of animals. Coal is an example of organic sedimentary rock.

Answer 2

$\huge \rm \red{answer}$

Organic sedimentary rocks form from the accumulation and lithification of organic debris, such as leaves, roots, and other plant or animal material. Rocks that were once swampy sediments or peat beds contain carbon and are black, soft, and fossiliferous.