Natural HAZARDS

Natural disaster: Catastrophe resulting from a natural hazard Magnitude: The force of a natural phenomenon Richter scale: The magnitude of earthquakes ranging from 1 to 9 Natural hazard: Danger linked to a natural phenomenon Vocabulary

Types of Natural hazards Natural Hazards have different origins Geological hazards are connected to movements within the earth such as earthquakes and volcanoes or landslides Meteorological hazards include severe tropical storms, heavy precipitation, high winds and very high temperatures Hydrological hazards include tidal waves and floods Types of Natural hazards

Every day on earth we have 1000 small earthquakes registering from 1-2 on the Richter scale Approximately 1 every 87 seconds Another 800 reach magnitude 5-5.9 18 reach 7 or higher Earth Quakes

Volcanoes and storms 1500 volcanoes are presently active Active means they have erupted or will erupt soon Every Year 80 cyclones sweep across the oceans Less severe storms can also cause damage Volcanoes and storms

cone crater Lava flow Parts of a Volcano

Extrusive eruptions cause magma(molten rock) to flow down the sides of volcanoes Because of the magma’s color these are called red volcanoes Laval flows down the volcano at speeds of 50-100 km Lava can reach 1200 degrees Celsius While it flows it cools and hardens There is no way to stop lava flows Extrusive Eruptions

Explosive eruption During an explosive eruption the cone explodes Lava, cinders, rocks and gases built up inside the crater burst out forming a heavy cloud above it The color of this cloud gives this volcano it’s name a grey volcano The toxic dust and particles contained in this lava can reach the ground hundreds of kilometers away These ejections can destroy all forms of life and structures The toxic cloud causes no physical damage but it asphyxiates living creatures Explosive eruption

Mount ST Helen’s and Krakatoa https://www.youtube.com/watch?v=Ec30uU0G56U https://www.youtube.com/watch?v=UORtQFZejeg Mount ST Helen’s and Krakatoa