What is the difference between mobile & molten rock? In the book Fundamentals of Geomorphology (Routledge Fundamentals of Physical Geography) by  Richard John Huggett there is a  sentence " Intruded rocks, which must be mobile but not necessarily molten, may have a direct effect on landforms by causing doming of the surface." What is the difference between molten &amp; mobile rock?
Molten rock must be a liquid, mobile rock is any rock capable of moving, sand and mud can be mobile.