Question

How do detrital, chemical and organic sedimentary rocks differ from each other?

Answer 1

Hint: Rocks are naturally occurring solid masses that are made of a mineral or a mixture of minerals. Rocks are further classified into three types: igneous rock, metamorphic rock and sedimentary rock.

Complete answer:
Sedimentary rocks are formed by the accumulation of fragments and sediments of other rocks which have undergone weathering and erosion.
Sedimentary rocks are further classified into detrital , chemical and organic sedimentary rocks. These differ on the basis of the sediments from which they are made.
Detrital sedimentary rocks are also called clastic sedimentary rock which are formed by solid products of weathering, like clay, gravel,sand which is cemented together by the dissolved weathering products. These are further classified based on their grain sizes.
Organic sedimentary rocks are formed by lithification of organic debris like plants and remains of animals. Coal is an example of organic sedimentary rock.
Chemical sedimentary rocks are formed when dissolved minerals come out of water as mineral constituents in solution become supersaturated and inorganically precipitate. Gypsum, evaporites and chert are examples of the same.

Note: Sedimentary crusts cover $73\mathrm{\%}$ of earth's surface and $8\mathrm{\%}$ of the volume of the crust. Another point to note is that sedimentary rocks have internal layering which is called bedding or stratification.