Geography Chapter 1

Question	Answer
Crust	5-100km think. Contains minerals. Igneous, Sedimentary and Metamorphic
Lithosphere	Moho, Upper Mantle and Crust
Moho	Thin band near crust. Marks change between mantle and crust
Asthenosphere	Upper Mantle. Flows like treacle
Upper Mantle	Solid. Lowest part of lithosphere
Lower Mantle	Solid and rocky. Silica rock
Outer Core	2200km thick. Iron and nickel. Liquid and metallic
Inner Core	1250km thick. Iron and nickel. Solid and metallic
Oceanic Crust. SIMA	6-12km thick. Dense rock, eg Basalt. Younger. Silicone and Magnesium
Continental Crust SIAL	40-60km think. Less dense, eg Granite. Older. Silicone and aluminium
Continental Drift	Wegner. Large land mass: Pangaea. Identical fossils, matching mountains & matching coastline shape
Sea Floor Spreading	Hess. Under water volcano. New crust. Existence of mid ocean ridge, varying sea floor age and similar glacial deposits
Destructive	Oceanic-Continental Continental- Continental Oceanic-Oceanic
O-C Collision	Oceanic slides under, heavier. Melt and Recycled. Explosive Volcanoes, eg Mt St Helens Earthquakes and trenches Pacific Ring of Fire
O-O Collision	Trenches and Islands Heavier subducts. Deepest part of ocean. Islands from plums of magma strong earthquakes

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	Created by Maire Mohally almost 12 years ago