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Year 9 Geography

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Term
Definition
Magma   molten rock in the earth's mantle  
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Epicentre   where an earthquake originates/is focused  
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Lahar   Indonesian word for mud-debris landslide that flows from volcanoes  
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Viscosity   how thick or runny lava is, affects explosivity  
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Inner core   centre of the earth, solid, made of iron and nickel  
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Focus   point on the earth's surface directly above the epicentre  
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Plates   large slabs of crust/rock which continually move and/or float on the mantle  
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Destructive plate boundaries   A destructive plate boundary happens where an oceanic and continental plate move towards each other.  
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Convergent plate boundaries   when the earth plates collide and the area is lost either by the shortening and crustal when the earth plates collide and the area is lost either by the shortening and crustal thickening or by the subduction of one plate beneath the other  
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Composite volcano   Large, steep volcano built up of alternating layers of lava and ash or cinders  
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Dome volcano   a roughly circular mound- shaped protrusion resulting from the slow extrusion of viscous lava from a volcano  
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Shield volcano   a type of volcano usually built almost entirely of fluid lava flows.  
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Divergent plate boundaries   places where the tectonic plates of the Earth are moving away from each other.  
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ash   is blasted into the earth from a volcano  
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sulphur dioxide   a gas which is blasted into the earth from a volcano  
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Created by: tescommonstacks
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