Earth's layers are the
and
the
are composed primarily of the
elements
and silicon. these are known as
silicates of the mantle contain heavier elements. this makes them denser than those found in the
crust. the
is composed of the densest materials, primarily iron and
nickel. earth's layers can also be identified using each layer's physical state of
the crust and the uppermost part of the mantle together
make up a layer called the
the lithosphere is the cool, rigid.
outermost layer of earth. the lithosphere is in the
state of
matter. the study of
provides evidence of varying interior layers.
indications of a
include a change in seismic wave direction.