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Volcanoes

Class Talk Term 1 - Year 6 Student
by

Maya Bringas

on 19 May 2015

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Transcript of Volcanoes

Volcanoes
By Maya Bringas 6F
A Definition on Volcanoes
A volcano is a mountain that opens downward to a pool of

molten rock

below the surface of the earth. When pressure builds up eruptions occur,it than opens up and fills the air with

lava fragments.
How
is

a

Volcano/Volcanic

eruption

caused

?
When rock in the mantle melts,it moves up to the surface through the crust, it releases pent-up gases and volcanic eruptions. Extremely high temperatures and pressure causes the rock to melt and become liquid rock or magma . When a large body (amount) has formed, it rises through the denser (harder) rock layers towards the earths surface.
Where do volcanoes occur ?
A volcanic eruption can occur anywhere, where a volcano has formed. A fact about volcanoes that you properly don't know is that volcanoes haven't just been found in our planet, Earth. Volcanoes have also been found in other planets. Mars has 18 (Yes, someone actually counted them),Venus has a few thousand, Saturn nobody knows, Neptune, Mercury and our Moon maybe none- at most, a few and Jupiter is interesting because it has 16 moons. Io (io), the largest of the moons has hundreds of active volcanoes, these volcanoes produce gases that contain sulfur (atomic,6 yellow).
What are the effects of volcanoes on the
environment, people and animals ?
Environment:
A erupting volcano emits gases & dust particles that can cause profound changes in weather and climate throughout the world. But volcanoes can also create new lands, provide habitats for homeless animals and generate beautiful landscapes.
People & Animals:
Volcanic ash is abrasive and hard like finely crushed glass, if the ashfall is really heavy it can make it impossible to breath. After blasting it forms an eruption plume. Which settles over huge areas suffocating animals and people. A pyroclasticflow is a mixture of hot gases and ash, if you get caught in one it will kill you.
Well before i start there's something i would like to tell you about volcanoes, before i tell you about the effects of volcanoes. It's that volcanoes don't just give bad effects to this land, they also give us some good effects to help people and the environment. Your probably wondering 'What is she talking about, how can a volcano have good effects'. Well let me tell you some good and bad effects from volcanoes.
How do scientists measure a volcano ?
Volcanic eruptions are measured based on the volcanic explosiveness. Volcanologists ten take a number of different factors into account. Then that's when they determine the 'bigness' of a volcano / volcanic eruption.
How can a volcano be predicted ?
Volcanologists use different different kinds of tools including instruments that measure underground deformination, instruments that detect volcanic gases and instuments that determine how how much lava is moving. Some of the simpler tools used to predict a volcano/volcanic eruptionare videos and cameras, satellite images and webcams !
What safety measures can be undertaken to prevent damage and loss of life ?
1. Know before hand where the active volcanoes are in your area.
2. Find out whether or not they're likely to affect you and where your living, if they are put together a emergency supply kit, this should include a First Aid kit, Food & Water to last you at least 3 days, a mask, a manual can opener, a flash light with some extra batteries & more
3. Set a emergency evacuation plan
Example:
Mt Tambora
Conclusion~
In conclusion, volcanoes are cracks in the Earth’s crusts where magma has reached the surface and turned into lava. There are about 500 volcanoes spread out all over the world, and 452 of them live inn the ring of fire. Although volcanoes are most known for the destruction they can do, there have been several cases where volcanoes have helped create lands such as the beautiful Hawaiian Islands. I believe there is no experience that is more impressive than seeing one of these spectacular volcanoes, they are sure to leave memmorable impressions on people of any age.


~Tambora, Indonesia
~It had the largest amount of material ever erupted
~More than a 100 times that then of Mt St Helens
~Eruption killed 1200
~Then later 82 000 died from famine and disease
Full transcript