the outer boundary of an artifact or a material layer constituting or resembling such a boundary
the extended two-dimensional outer boundary of a three-dimensional object
the outermost level of the land or sea
cause to change; make different; cause a transformation
a relational difference between states; especially between states before and after some event
undergo a change; become different in essence; losing one's or its original nature
an event that occurs when something passes from one state or phase to another
become different in some particular way, without permanently losing one's or its former characteristics or essence
the action of changing something
the result of alteration or modification
