1. Natural HAZARDS

2. 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

3. 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

4. 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

5. 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

6. cone
crater
Lava flow
Parts of a Volcano

7. 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 km
Lava can reach 1200 degrees Celsius
While it flows it cools and hardens
There is no way to stop lava flows
Extrusive Eruptions

8. 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

9. Mount ST Helen’s and Krakatoa
Mount ST Helen’s and Krakatoa