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Palaeomagnetism
Changes in earths magnetic field where it changes from magnetic North to magnetic South - stored in newly formed rock
Island arcs
Collection of volcanic islands formed 100km from the plate margin and found above an o/o subduction zone
Benioff zone
Depth at which the subduction zone causes melting of plate
Orogeny
Mountain building event
Viscosity
The resistance of a fluid to flow, where a high value means liquid does not like to flow (high viscous)
Volatiles
Components of magma which are dissolved (water and carbon dioxide) until it reaches the surface where they expand and explode - the more volatiles the more explosive
Silica
A hard, unreactive, colourless mineral - one of the most abundant elements on earth, contained within magma and main ingredient in sand
Mitigation
The action of reducing the severity, seriousness or painfulness of something