Volcanoes 4.0 / 5 based on 2 ratings ? GeographyNatural hazardsASAll boards Created by: Paige RhodesCreated on: 23-01-13 16:49 What plate margins do volcanoes occur at? Constructive and Destructive. 1 of 28 Which plate margin offers the biggest hazard from volcanic activity? Destructive (Oceanic/Oceanic) 2 of 28 Which plate margin offers the lowest hazard from volcanic activity? Constructive --> <-- 3 of 28 What is a hazard? The threat/rick to people. 4 of 28 Where does the pressure in a volcano build up? In the magma chamber. 5 of 28 How many types of volcano is there? What are they called? 2. Shield and Composite. 6 of 28 Which volcano has steeper sides? Composite. 7 of 28 Which volcano is has more viscous (thicker) liquid? Composite. 8 of 28 Which volcano has less violent eruptions? Shield. 9 of 28 What affects how hazardous a volcano will be? Type of plate margin. 10 of 28 The less viscous a volcano is the less...? Explosive it will be. 11 of 28 The more viscous a volcano is the more...? Explosive it will be. 12 of 28 Which plate margin do shield volcanoes occur? Constructive Plate Margin. 13 of 28 Which plate margin do composite volcanoes occur? Destructive Plate Margin 14 of 28 What are volcanoes measured on? The Volcanic Explosivity Index (VEI) 15 of 28 How many hazards are associated with volcanoes? 5. 16 of 28 What are the hazards associated with volcanoes? Lahars, Lava Flows, Pyroclastic Flows, Tephra and Volcanic Gases. 17 of 28 What is a Lava Flow? A flow of lava from the volcano. 18 of 28 Can a Lava Flow's route be predicted? Yes, they follow a valley/river. 19 of 28 Can Lava Flow's be stopped? Yes, they will eventually cool down or it can be cooled down physically. 20 of 28 What is a Lahar? A Lahar is a fast flowing mixture of water, ash and debris. 21 of 28 Can a Lahar's route be predicted? Yes, they follow a valley's route. But you can't predict how far they will travel. 22 of 28 Can Lahar's be stopped? No. They have a liquid concrete consistency and will eventually set to from new ground. 23 of 28 What is a Pyroclastic Flow? A fast moving flow of gas and debris. 24 of 28 Can a Pyroclastic Flow's route be predicted? No. They can travel in any direction. 25 of 28 Can a Pyroclastic Flow be stopped? No, due to the speed, debris and temperature of the gas they destroy everything in it's path. 26 of 28 What is a Tephra? Is the debris that gets thrown up in the air out of the volcano. 27 of 28 What are Volcanic Gases? They are gases released by the volcano. 28 of 28
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