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Lecture 5

EESA06 Lecture 5 Notes


Department
Environmental Science
Course Code
EESA06H3
Professor
Nick Eyles
Lecture
5

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Lecture 5
How oceans close
Subduction dangerous
Pushing it below continents
Magma have a lot of silica
Rheology: the ability to flow.
Iceland volcanoes are very fluid so all gases come out
If the fluid is stiff the gases cant come out and they choke; pyroccastic broken by fire
Bomb or ash
Missnoma, mistake
Volcanoes in Italy, they thought volcanoes were caused by coal
NOT burnt material
The not so pacific ocean: its floor is being cloched by surrounding continents. NA moving
left. Australia is moving north and will be in modern Tokyo
Ring of fire; dense volcanoes and earthquakes and tsumanis; sea floor lowered or raised
after earthquakes
The deepest earthquakes 700 kilometres down, they maintain their integrity
Magmatic arches above the subduction zone
The oceanic crust is made of basalt, large amount of sea water and sediments and melted
we produce silicic magma. This reduces the viscosity of the magma
Stiff magma causes explosive eruptions
Deep water trenches is where the ocean floor is just going down to the subduction zone
New Zealand is a small island, it is the tip of a much larger land mass, zealandia and it is
almost a continent underwater
The teeth like marks indicate the direction of subduction
www.notesolution.com
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