Geography 0.0 / 5 ? GeographyRestless earthGCSEEdexcel Created by: Waffle21Created on: 24-04-16 15:28 Continental crust Forms the land. Is about 30-50km thick. 1 of 9 Oceanic crust This is much thinner. Usually about 5-8km. 2 of 9 Structure of the earth Upper mantle - Lower mantle - Outer core - Inner core 3 of 9 Radioactive decay Some elements are naturally unstable and radioactive. Atoms of these elements release particles from their nuclei and give off heat. 4 of 9 Pangea The supercontinent. The idea that all of the continents fit together as one supercontinent 5 of 9 Conservative boundaries These types of plates slide past each other. Friction between them causes earthquakes. 6 of 9 Constructive boundaries Plates move away from each other and magma rises up in between the gap, solidifies and forms new land. 7 of 9 Destructive boundaries These plates push towards each other and oceanic plates are subducted. As it sinks it melts and makes magma called andesite. 8 of 9 Long term planning for earthquakes A damper for the roof reduces building sway. Cross bracing. Shock absorbers. A strong steel frame. Strong double glazing. Very deep foundations. 9 of 9
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