New deposits of rock debris on the volcano's slopes and in river valleys can be reworked to form lahars for many years after an eruption ends.
(New deposits of rock debris on the volcano's slopes and in river valleys; can be reworked; to form lahars for many years after an eruption ends) (an eruption; ends; )
New deposits of rock debris on the volcano's slopes and in river valleys an eruption
can be reworked ends
to form lahars for many years after an eruption ends