Name: ____________________________________________________ Date: ____________ Period: _____
Guided Notes: Volcanos
What is a volcano?
Types of Eruptions


A volcano is a _______________ on the crust
that allows ______________________________,
o __________________________________
_______________________, and __________ to
o Viscous (___________) lava traps the
escape from a ____________ chamber below the
gases until large pressures build up and
surface
__________________________________
o __________________________ (ash, rock
Where do volcanos occur?


fragments) flow out of vent
Volcanos mostly occur at ___________________
and _______________________ plate boundaries


o __________________________________
___________________________ to form magma
o __________________________________
flows easily allows gases to bubble away
Convergent boundaries produce ______________
________________________________________
Types of Lava
o At ________________ convergent boundaries

ocean (______________________________).

Viscous Lava (_______________)
o ______________ temperature
o Composition: silica-rich (granitic)
magma can form continental volcanic arcs
(___________________________________).
Lava is _______________________________
_____________________________________
o At ____________________ boundaries rising

Non-Violent (__________________________)
Plate motion causes _______________________
rising magma can form volcanic arcs in an

Violent (_____________________)

Fluid Lava (_______________)
o _____________________________________
o _______________ temperatures
Divergent boundaries produce the greatest
o Composition: Low silica (basaltic)
volume of __________________________ along
Other Ejected Materials
the _____________________________________

Dissolved gases
The remaining volcanos occur within a plate and
o Mainly ____________________________
not at a boundary which is called
o If gases escape easily then eruption is
________________________________________
o The regions are known as “______________”
o Volcanos form because a mass of hotter than
normal mantle material called a ___________
_________________ rises toward the surface.
o The Pacific plate moves over a hot spot,
producing the _________________________
_____________________________________
__________________________________

Pyroclastic Materials
o _________________ produced in volcanic
eruptions
o Range in size from very fine duct and
volcanic ash (less than 2 millimeters) to
pieces that weigh ____________________
Parts of a Volcano
Identify the type of volcano in each picture and

look up an example of each
A volcano is a ___________________________
________________________________________

A _________________ is the depression at the
Type: ___________________________________
summit of a volcano or that which is produced by
Example: ________________________________
a meteorite impact.

A ___________________ or a _______________,
carries gas-rich magma to the surface.
Label the picture below
Type: ___________________________________
Example: ________________________________
Type: ___________________________________
Example: ________________________________

Volcanos can also be defined by when they are
_____________________________________
o
Types of Volcanos

The three main volcanic types are shield
10,000 years
o
volcanoes, cinder cones, and composite cones

again
o
volcanoes built from ____________________

built primarily of pyroclastic material ejected
from a _______________________________
o _____________________________________
o _____________________________________
______________: hasn’t erupted in the
last 10,00 years and is not expected to
Cinder Cones
o Cinder cones are _____________volcanoes
______________: hasn’t erupted in the
last 10,00 years but it expected to erupt
Shield Volcanoes
o Shield volcanoes are broad, gently sloping
______________: has erupted in the last
erupt again
Look up an example of each of the following
types:
Active volcano: ___________________________
Dormant volcano: _________________________
Extinct volcano: ___________________________
o _____________________________________

Composite Cones
o Composite cones are volcanoes composed of
both lava flows and pyroclastic material.
o _____________________________________
o _____________________________________
o Most violent type of activity
Watch to learn more:
http://tinyurl.com/mubf6hn