Geography key terms. Linked to 2013 pre-release material

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Key Term: Definition: Reference:
Asthenosphere: A zone in the upper mantle of the planet where rocks Prosser et al,
become plastic and are easily deformed. Depth of Landmarks AS
100-350km Geography
Lithosphere: The rigid outer layer of the earth, comprising of the Prosser et al,
earth's crust and the solid upper layer of the mantle Landmarks AS
Geography
Intra-Plate Igneous activity which occurs within a plate boundary. Dunn et al
activity:
Inter-Plate Igneous activity which occurs at a plate boundary Dunn et al
activity:
Spatial Specific locations of study where tectonic activity
distribution: occurs
Hotspot: Theory proposed by Wilson. Areas which are stationary Journal: Hawaiian
in terms of plate movement , however are sources of Volcanism
heat and magma which are supplied to the earth's
surface
Phreatic caused by volcanically heated rock coming into contact www.usgs.org
eruption: with water
Magma Plume: A rising vertical mass of magma originating from the www.geography-d
mantle. ictionary.org
Disaster hotspot: Exposure to risk from two or more hazard groups. E.g: Warn et al, Edexcel
Pacific Ring of Fire AS Core Textbook
Continental Up to 70 km thick Waugh, An
Crust: Less dense rock ­ Mainly Granite Integrated
Approach
Oceanic crust: 6-10 km thick Waugh, An
More dense ­ Mainly Basaltic integrated
approach
Event profile: Describe tectonic hazards in terms of Frequency, Dunn et al. Edexcel
Magnitude, Duration and Areal Extent core textbook A2
A' a lava: Basaltic lava characterized by a rough or rubbly surface Erik Klemetti
Fracking: Shale gas extraction process The Guardian,
McGrath
Tectonic Tectonic hazards are tectonic events which have Whittow
Hazards: the potential to threaten life and property
Convection a result of heat from radioactive decay rising in
currents: exchange of cool air descending, creating a cyclical
motion, which is the driving force for plate
tectonic movement.
Aftershock: A smaller earthquake following the main shock of a
large earthquake
Landslide: sliding down of a mass of earth or rock from a
mountain or cliff
Tectonic Events: a physical occurrence resulting from the Dunn et al
movement or deformation of the earth's crust

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