When the beaker containing the salt solution is then heated on a hot plate, a well defined convecting bottom layer forms almost immediately.
(the beaker; containing; the salt solution) (the beaker containing the salt solution; is; then heated on a hot plate, a well defined convecting bottom layer forms almost immediately)
the beaker the beaker containing the salt solution
containing is
the salt solution
then heated on a hot plate, a well defined convecting bottom layer forms almost immediately