Natural Hazards (volcanoes and earthquakes) 0.0 / 5 ? GeographyNatural hazardsGCSEAQA Created by: Pi the pieCreated on: 04-03-18 17:12 A natural occurrence that does not pose a threat to society Natural Event 1 of 7 5-10km thick, dense, formed of basaltic rock, and usually less than 200 years old Oceanic Crust 2 of 7 20-200km thick, less dense, composed mainly of granite rock, and up to 38 billion years old Continental Crust 3 of 7 Occurs when plates move apart, e.g. The Mid-Atlantic Ridge Constructive Plate Boundary 4 of 7 Occurs when plates slide past each other in opposite directions, e.g. The San-Andreas Fault Conservative Plate Boundary 5 of 7 Occurs when two continental plates collide, forms fold mountains e.g. The Himalayas Collision Plate Boundary 6 of 7 Occurs when an oceanic and a continental plate move toward each other, e.g. When the Nazca plate is forced under the South American plate Destructive Plate Boundary 7 of 7
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