Most of the Earth s volcano and earthquake activity can be tied to sub-ocean ridges where plates form, or to continental masses and margins where plates collide or grind past each other.
(Most of the Earth s volcano and earthquake activity; can be tied; ) (plates; form; L:sub-ocean ridges) (plates; collide; ) (continental masses and margins; grind; )
Most of the Earth s volcano and earthquake activity plates plates continental masses and margins
can be tied form collide grind
L:sub-ocean ridges