Natural hazards 0.0 / 5 ? GeographyNatural hazardsGCSEOCR Created by: tallulahroseeCreated on: 30-12-16 13:51 Aftershocks Smaller quakes occuring in the same general area days to years after a larger event 1 of 24 Plate tectonics Study of the distribution and movement of the Earth's crustal plates 2 of 24 Fault A fracture in the Earth's crust that shows signs of movement 3 of 24 Subduction zone Area of a destructive margin where one plate descends beneath another 4 of 24 Nuees ardentes Highly destructive , fast moving clouds of ash and dust 5 of 24 Shield volcano Covers a large area with gently sloping sides 6 of 24 Strato (composite) volcano Tall, conical volcano composed of many layers 7 of 24 Lahar Mudflow made of pyroclastic material and water that flows down from a volcano 8 of 24 Pyroclastic flow Avalanches of hot volcanic debris 9 of 24 Geothermal Energy generated by heat stored deep in the Earth 10 of 24 GPS (Global Positioning System) Group of satellites that allow people to find out their exact location on the Earth's surface 11 of 24 Epicentre Point on the Earth's surface directly above the focus of an earthquake 12 of 24 Seismic waves Vibrations generated by an earthquake 13 of 24 Blind fault A fault where the fault line doesn't reach the Earth's surface 14 of 24 Cyclone System of winds rotating inwards to an area of low pressure 15 of 24 Hurricane Violent tropical storm in the Caribbean region 16 of 24 Typhoon Violent tropical storm over the Indian and Pacific oceans 17 of 24 El Nino Large climatic disturbances in the Southern Pacific ocean, occurring every 3-7 years 18 of 24 Desertification Degradation of land in arid and semi-arid areas primarily due to human activity and influenced by climatic variations 19 of 24 Seismometer Device used to measure the intensity of seismic waves and detect changes underground 20 of 24 Liquefaction When the soil is compacted and its water content separates and rises, causing a flood 21 of 24 Secondary effects Long term effects, caused by the primary effects 22 of 24 Focus The point below ground where an earthquake occurs, where stored energy is suddenly released 23 of 24 Lava Magma (molten rock) once it has risen to the surface of the Earth 24 of 24
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