Halliday & Matthiessen (1999: 167):
The Goal is impacted in some way by its participation in the Process; the “impact” either (i) brings a participant into existence or else (ii) manipulates one that already exists. If the Goal is something that already exists, the result of the Process is to bring about some change — in its location, make-up, temperature, shape, &c.; and the result may be construed as a separate element, with the function Attribute or Rôle. […] There is no such impacting in the case of the Range.