Sedimentary rocks are formed when many layers of sediments, such as mud, sand, shells, corals, marine animals, and others, settle on the bottom of the ocean floor.
(Sedimentary rocks; are formed; ) (many layers of sediments, such as mud, sand, shells, corals, marine animals, and others; settle; )
Sedimentary rocks many layers of sediments, such as mud, sand, shells, corals, marine animals, and others
are formed settle