2 Sufficiently large and rapid geological activity (volcanoes, etc.) forwhatever reason (including man-made physical changes to forces on geologicalstructures such as large and poorly located dams) could cause releases ofsufficient gases and particles to kill all life on earth.
(2 Sufficiently large and rapid geological activity; could cause; ofsufficient gases and particles) (ofsufficient gases and particles; to kill; all life on earth)
2 Sufficiently large and rapid geological activity ofsufficient gases and particles
could cause to kill
ofsufficient gases and particles
all life on earth