Politicas de segurança

Natural and Weather
Catastrophes

Trabalho realizado por :
Daniel Carvalho 11-005
Critiano Valentim 11-208
Paulo Cordeiro 11-019

Introduction

We are gonna talk about some of the Natural and Weather catastrophes like :
-Volcanoes
-Floods
-Tsunami
-WildFires
-Lightning
-Hurricane

Volcanoes

Volcanoes are manifestations of the fiery power contained deep within the Earth. These formations are essentially vents on the Earth's surface where molten rock, debris, and gases from the planet's interior are emitted. When thick magma and large amounts of gas build up under the surface, eruptions can be explosive, expelling lava, rocks and ash into the air. Less gas and more viscous magma usually mean a less dramatic eruption, often causing streams of lava to ooze from the vent.

Floods There are few places on Earth where people need not be concerned about flooding. Any place where rain falls is vulnerable, although rain is not the only impetus for flood. A flood occurs when water overflows or inundates land that's normally dry. This can happen in a multitude of ways. Most common is when rivers or streams overflow their banks. Excessive rain, a ruptured dam or levee, rapid ice melting in the mountains, or even an unfortunately placed beaver dam can overwhelm a river and send it spreading over the adjacent land, called a floodplain. Coastal flooding occurs when a large storm or tsunami causes the sea to surge inland.

Tsunamis

Wildfires Uncontrolled blazes fueled by weather, wind, and dry underbrush, wildfires can burn acres of land, and consume everything in their paths in a matter of minutes. A wildfire moves at speeds of up to 14 miles an hour (23 kilometers an hour), consuming everything, trees, brush, homes, even humans in its path. There are three conditions that need to be present in order for a wildfire to burn, which firefighters refer to as the fire triangle: fuel, oxygen, and a heat source. Fuel is any flammable material