Convergent boundaries move towards each other. They can be classified as continental-continental, or oceanic-continental.
Oceanic-Continental: Heavier oceanic plate slides under a continental plate in a process called subduction.
Continental-Continental: Tectonic plates push up against each other and often fold upwards, creating mountain ranges.
Her mass stays the same and her weight changes
I'd say that because of gravity and the material made the red giant it's holding all the material together to be in one piece years and years to come.
Hope that helped! <3 ^-^
Its larger and if u where wondering to positive ions are smaller