Definition of Intrusive rocks
(Geol.)
rocks
which
have
been
forced
,
while
in
a
plastic
or
melted
state
,
into
the
cavities
or
between
the
cracks
or
layers
of
other
rocks
.
The
term
is
sometimes
used
as
equivalent
to
plutonic
rocks
.
It
is
then
contrasted
with
effusive
or
volcanic rocks
.
See also:
Intrusive
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