A ROCK is defined as "a naturally occurring, solid substance composed of one mineral or a mixture of minerals that form an essential part of the Earth's crust."
(A ROCK; is defined; as "a naturally occurring, solid substance) (a naturally occurring, solid substance; composed; of one mineral or a mixture of minerals) (minerals; form; an essential part of the Earth's crust)
A ROCK a naturally occurring, solid substance minerals
is defined composed form
as "a naturally occurring, solid substance
of one mineral or a mixture of minerals
an essential part of the Earth's crust