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Volcanic Mountains
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What are Volcanoes?
A volcano is most commonly a conical hill or
mountain built around a vent that connects with
reservoirs of molten rock below the surface of the
Earth.
Lava (liquid rock), gases and molten rock fragments
called Ash OR Cinders flow through a fracture in the
crust.
These flows can be either violent eruptions or mild,
slow flows.
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What causes them to erupt?
Driven by buoyancy and gas pressure…
Molten rock, which is lighter than the surrounding solid rock, forces its way upward and may ultimately break though zones of weaknesses in the Earth's crust.
Molten rock below the surface of the Earth that rises in volcanic vents is known as magma.
After it erupts from a volcano it is called lava.
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3 Types of Volcanoes
Ash and Cinder Cone
Shield Cone
Composite Cone
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Ash & Cinder Cones
Explosive gas-charged eruptions send lava to great heights.
As the lave cools, small fragments solidify and fall as cinders around
the vent to form a circular or oval cone.
Most cinder cones have a bowl-shaped crater at the summit and rarely
rise more than a thousand feet or so above their surroundings.
Cinder cones are numerous in western North America as well as
throughout other volcanic terrains of the world.
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Ash & Cinder Cones
Cone shaped
Symmetrical
Steep sides
Violent eruptions
Layers of ash & Cinder
Single central Vent
Crater at Summit
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Ash & Cinder Cones
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Shield Cones
Shield volcanoes are built almost entirely of fluid lava
flows.
Flow after flow pours out in all directions from a central
summit vent, or group of vents, building a broad, gently
sloping cone of flat, domical shape, with a profile much like
that of a warrior's shield.
They are built up slowly by the accretion of thousands of
highly fluid lava flows called basalt lava that spread widely
over great distances, and then cool as thin, gently dipping
sheets.
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Shield Cones
Shield - shaped
Flat, Shallow sides
Non-Violent slow emissions of lava
Layers of lava
No one single vent
Covers Large area
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Shield Cones
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Composite Cones
The essential feature of a composite volcano
is a conduit system through which magma
from a reservoir deep in the Earth's crust
rises to the surface.
The volcano is built up by the accumulation
of material erupted through the conduit and
increases in size as lava, cinders, ash, etc.,
are added to its slopes.
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Composite Cones
Shape not as steep as ash & cinder
Non-Violent slow emissions of lava one time
and violent ash eruptions next time
Layers of alternating lava & Ash/cinder
Weak sections may form in the side of the
cone.
Lava flows out of these forming smaller
cones
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Composite Cones
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Volcanoes
MUST
READ!!!
Textbook
P. 14-16
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Pacific Ring of Fire
Volcanoes occur all
around the Pacific
ocean.
At the tectonic plate
boundaries.
Pattern known as the
Pacific Ring of Fire
Activity-Unit1 Handout
Tectonic plate video
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Pacific Ring of Fire