10. A Shield Volcano has a wide
base with gently sloping
sides.
The cone is made up of
purely lava poured out
during a quiet eruption.
11.
12. A Cinder Cone Volcano is
built mostly of loose
fragments called Cinders
(pyroclast and tephra) .
Cinder Cone volcanoes are
formed by explosive
eruptions.
15. Composite Volcanoes are
made up of alternating layers
of lava and cinders
(pyroclasts).
Composite Volcanoes are
formed when volcanic
eruptions vary between quiet
and explosive eruptions.
16. When a violent eruption large
volume of pyroclasts, lava,
gases and ashes are ejected.
When the eruption is quiet,
large volume of lava is
extruded over the top of the
pyroclastic layer.
19. Volcanoes are usually found
near the plate boundaries
or over geologically active
hotspots.
20.
21. A volcano is considered
active if it is currently
erupting or showing
regular signs of volcanic
activities.
22. An active volcano has a
record of eruption within 50
years.
Example: Mt. Kilauea, the
worlds most active volcano,
Mt. Mayon, Mt. Taal and Mt.
Kanlaon
28. Seismologists found out
that the longer period of
dormancy between volcanic
eruptions will have a
greater chance of having a
very explosive eruption in
the future.
29.
30.
31. Extinct Volcanoes are those
that have not shown signs
of activity for a long period
of time.
It has no record of eruption
in the last 1000 years.
