Key Words - Global Hazards 0.0 / 5 ? GeographyNatural hazardsGCSEOCR Created by: Riya.b123Created on: 10-02-19 15:20 What are winds? Large scale movements of air 1 of 18 Tropical Storm Intense low pressure weather systems with heavy rain & strong wind that spiral at the centre. 2 of 18 Drought Long period when rainfall is below average 3 of 18 Flash Flood When lots of water suddenly flows into a river causing it to overflow its banks 4 of 18 Heatwave Long period during which temperatures are higher than noraml 5 of 18 Plate Boundaries The point where plates meet 6 of 18 Convection Currents A movement within the Earth's mantle caused by heat of the core 7 of 18 Subduction When one plate is forced under the other 8 of 18 Earthquake Sudden violent shaking of the Earth causing destruction 9 of 18 Epicentre Point on the Earth's surface directly above the focus 10 of 18 Focus The point underground beneath the epicentre where plates snap apart 11 of 18 Richter Scale Measures the energy released from an earthquake 12 of 18 Seismic Waves Shock waves travelling through Earth 13 of 18 Sesmometer Detects seismic waves 14 of 18 Pyroclastic Flow Super heated currents of gas, ash & rock 15 of 18 Hotspot An area of intense volcanic activity where there are no PB - bit of the earth's crust which is hotter than normal 16 of 18 Lahar Destructive mudflow consisting of volcanic debris, mud, rock, water 17 of 18 Tiltmeter Device that measures the change of the landscape 18 of 18
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