Shale (rock) Shale is a fine-grained sedimentary rock that is formed by the compression of muds.
(Shale (rock) Shale; is; a fine-grained sedimentary rock that is formed by the compression of muds) (a fine-grained sedimentary rock; is formed; by the compression of muds)
Shale (rock) Shale a fine-grained sedimentary rock
is is formed
a fine-grained sedimentary rock that is formed by the compression of muds
by the compression of muds