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Volcanoes Project

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Kevin Nguyen

on 16 June 2014

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Transcript of Volcanoes Project


Mayerling was never here
Volcanoes Project
Mayerling Colin,
Jackie Le
,
Kevin Nguyen
Block 8, Science
March 4, 2014

Introduction
Shield Volcano: Description and Lava Type
Shield volcanoes are the largest of all the volcanoes. Being able to stretch up to 100 kilometers, these volcanoes look a lot like shallow hills and they have gentle sloping sides. Plus, they are actually the most common. They occur on
hot spots
or mid ocean ridges. Moving on, the
lava
is runny and slow. In fact, this lava cannot pile up into a hill. Instead, it surrounds the shield volcano in its liquid stationary form. This is called basalt lava.
Shield Volcano: Type of Eruption
Shield volcanoes usually have low explosions when erupting out of their dull
summit craters
since they have less silica than that of other volcanoes and are only 10 percent
pyroclastic flow
,
is a hot moving current with hot gas and hot rock

. In fact, having less silica decreases the stickiness of the
lava
when
erupting
which allows the lava to easily slide pass the wall of the volcano. In addition, it is because water leaks into the
vent
of shield volcanoes.
Shield Volcano: Examples and Last Known Eruption

Examples of shield volcanoes:
Mauna Loa -
H
a
w
a
i
i
Fernandina Island - Ecuador
Menengai - Kenya
Erta Ale - Ethiopia

On March 26, 1984, Mauna Loa started
erupting
and began increasing its intensity for the past 3 years. Several earthquakes were created with up to a 6.6 magnitude and in the end, about 80 people died with parks and homes being destroyed and threatened.




Cinder Cone: Description and Lava Type
Cinder cone volcanoes look like an upside down ice cream cone, that is where this volcano gets its name. They are formed by strombolian
eruptions
, or an explosive
eruption
. The longer the
eruption
, the cone gets higher and higher. This volcano is made out of ash. Cinder cones tend to erupt,just like any other volcano , lava is thrown into the air, which cools down and goes back to the volcano, which makes the volcano grow. This volcano grows very quickly. The volcanoe's lava is made of of scoria or cinders.
Cinder Cone: Type of Eruption
As you know, all volcanoes tend to
erupt
. Cinder cone volcanoes also erupt. Its eruption can range from non-violent to violent. But, this volcano doesn't really hurt humans, so it is safer than other volcanoes. But again, this IS a volcano, so you shouldn't hang around it when it is about to erupt.
Composite: Description and Lava Type
Cinder Cone: Examples and Last Known Damage
Examples of cinder cone volcanoes:
Paricutin-Mexico
Surti I-Iceland
Surti II-Iceland
Taal Volcano- the Philippines
Sunset Crater- Arizona

Damage from Sunset Crater:
- last erupted in 1085
-covered 800 square miles with lava
-destroyed a lot of trees
Composite: Type of Eruption
A composite volcano's
eruption
is very violent. It can cause landslides, avalanches, and even tsunamis ! Composite volcanoes are also known to cause
lahars
otherwise known as a mudflow. Viscous magma rises and clogs the crater pipe. Gases will become locked up and when the volcano erupts its pressure will increase as well as the
magnitude
. In other words you do NOT by any circumstances want to be near this type of volcano when it's about to erupt.
Composite: Examples and Last Known Damage
Examples of composite volcanoes:
Mt. St. Helens in Washington
Mt. Fuji in Japan
Mt. Etna and Mt. Vesuvius in Italy
Mayon in the Philippines

Mt. St. Helens last
erupted
in May 18, 1980 killing 57 people, and destroying 250 homes and many bridges. The volcano's eruption blew most of its peak off and left a wide horse shaped crater. It is known as the most economically destructive volcano in the United States.
Hello and welcome to our prezi about volcanoes. As you all know, there are three types of volcanoes: Shield, Cinder Cone, and Composite (stratovolcano). Today, we will explain all of these volcanoes and what factors contribute to the distinct shape of each volcano. We hope you enjoy and gain more knowledge about volcanoes throughout our presentation.
-Jackie, Kevin, Mayerling


Thanks for watching/listening to our Volcanoes Project! Bye!!
Fun Fact #3
The word volcano comes from the Roman god of fire, Vulcan, also known as Hephaestus in Greek.
Fun Fact #1
Over 75% of all volcanoes on Earth are in the Pacific Ring of Fire
Fun Fact #2
The biggest known volcano in our solar system is on Mars. It is called Mount Mons, also known as Olympus Mons. It is 600 km wide and 21 km tall!
http://www.sciencekids.co.nz/sciencefacts/earth/volcano.html
Visit this site for more fun facts:
Composite volcanoes are built throughout hundreds of years by many layers of hardened lava and volcanic ash of previous eruptions. They have broad wide bases and their

lava

type cools

before spreading too far due to their high viscosity. The

magma

issuing from the volcano is usually

felsic
or has a large amount of silica. However they usually lack in iron or magnesium so the lava isn't

mafic
.
i like kevin - mayerling
Christine + StevenefhuiAEWTTEWI
There is one major factor that contributes to the differences between a shield, cinder cone, and composite volcanoes' shape. The reason that these volcanoes have different shapes is because the explosiveness of the volcano. This means that if the lava is very viscous, there is more silica. Silica makes lava more stickier With this, the summit crater would clog up, which creates high pressure. Once the lava finally comes out of the crater, it is explosive due to the high pressure.
Bibliography
" A New Year, A Continuing Eruption."
Volcano World
. Oregon State University. Web. March 2,2014
"Explore Mount St. Helen...Discover Ecosystems in Action"
Mount St. Helens National Volcanic Monument
. United States Department of Agriculture. Web. March 3, 2014
Earth Science. Austin Texas: Harcourt Education Company, 2
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