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Transcript of Volcanoes
Have you ever wanted to know how volcanoes work?
Volcanoes on Earth
The Cinder Cone, Composite Cone , and Shield Volcanoes
Game on the different kinds of volcanic rocks
Volcanoes don't just happen anywhere, certain patterns occur. Here is a list of volcanically active locations:
The Ring of Fire
both the west coasts of North and South America , the Aleutian Islands, East Asia,
the Philippines, Indonesia, and New Zealand.
A band that stretches from the Mediterranean through Iran
Windward islands of the Caribbean
Along mid-ocean ridges.
Where do Volcanoes occur?
What is a Volcano?
A volcano is vent in the earth's surface in which substances such as
Some volcanoes erupt, while others simply leak.
The composite volcano
Gas, Ash, Lava, Dust, and Pyroclastic materials
- dissolved gases from magma, mainly water vapor, sulfate dioxide, carbon dioxide, and hydrogen sulfate
- fine particles of rock.
- Molten basalts and andesites.
- Extremely fine particles, smaller than ash.
- fragments of rock, volcanic glass, and lava. (Size varies)
Three factors of magma that affect the type of volcano:
- how thick
the magma is; viscosity
determines how magma flows.
of dissolved gasses.
Different Types of Magmas Determine the type of Volcano.
What types of volcanoes form at
Divergent Plate Boundaries
Volcanic Hot Spots
Convergent Plate Boundaries
from the mantle rise,break through the crust,and push plates apart at divergent boundaries.
occur on land (continental rift valleys),but most occur undersea along mid-ocean ridges.
molten rock passes through the mantle and oceanic crust and erupts through a fissure in a quiet,non-explosive manner.The rising mantle rocks and oceanic crust are basalt,so the lava is basaltic.
Magma comes from partially melted mantle(basalt)and continental crust(granites)and erupts non-explosively through a rift.The lava consists of
What types of volcanoes form at
one plate sinks under another,the sinking plate partially melts,and the molten rocks rise through the overlying plate.
Magmas consist of molten rock from the mantle and ocean plates themselves and erupt explosively forming volcanic island arcs.The lava tends to be mostly basalt and some andesite.
Magmas consist of mantle,oceanic crust,and continental crust;erupt explosively;and form composite and cinder cones along the continental margins.The lava tends to be rhyolite and andesite.
Where a plate moves across a rising mantle plume you have a
In the ocean,
rising molten rock from the deep mantle melt through the ocean crust,erupt non-explosively on the ocean floor,and build up shield volcanoes,which become chains of volcanic islands.
The lava consists of basalt.
are an example of this type of hot spot volcano.
On the continent,
the rising molten rocks must pass through continental crust and erupt non-explosively through fissures.The lava tends to be flood basalt and rhyolite.
The Type of Magma Determines the Type of Volcano.
Thank you for watching! We certainly hope you enjoyed our presentation and that it has increased your knowledge on volcanoes!
This presentation was created by:
Alexis Schwartz and Rebecca Miller