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Geogrphy Revision (Violent volcanoes (Formation (Then dust and smoke comes…
Geogrphy Revision
Violent volcanoes
Formation
They are formed as when their is a weakness in the crust and magma works it way up.
Then dust and smoke comes up this can cause one of two volcanos
Composite volcanoes
These are infrequent, but are often violent
Shield volcanoes
These are more frequent, but are non-violent
placement
Volcanoes form on plate boundries due to the weakness there.
Plates and plate boundries
You have layers to the earth
1st Crust
This is the first layer of the earth and is very thin. It is made up of many plates
2nd Mantle
This moves the plates slowly using convection currents. This is done by the hot magma being pulled up to the cooler crust which it then cools causing it head back down
3rd Outer core
This heats the Mantle and helps the magntic field as the lquids in it spin causing the forming of the magnatic field.
4th Inner core
The elements in it decay and radiate heat
Structure of the earth
Monserat
Icelandic eruption
Haiti
Tsunamis
Boxing day Tsunami
Middle east