Geography
A hazard is a situation that poses a level of threat to life. Volcanoes exist all over the world and countless of them go over without us releasing because they are all of different magnitude. Only 10% of volcanoes are monitored around the world from which 90% of these are located in MEDC'S ( More Economically Developed Countries)
Volcanoes can pose different type of hazards separating into primary and secondary. Primary being the ash and dust, lava flow, volcanic gases and pyroclastic flow. How each one threatens the people live varies because ash and dust can disrupt transport therefore having an effect on any aid which may need to be brought in via planes. Also it can cause breathing problem due to high concentration of carbon and dioxide and sulphur gases found that erupt from the volcano. Pyroclastic flow is dense destructive mass of hot ash lava fragments and gases which are ejected in an explosion from a volcano and they travel at great speeds and destroy anything in its way. The image shows a pyrolcastic cloud. Lava can be disputed to be a secondary effect however in the eruption of Mount Nyirangongo 300 people were killed by lava travelling at more than 30 Kph in 1986. Although lava usually travels at relatively slow speed, basaltic lava which has low silica content therefore reducing the lava's weight and increasing its viscosity hence allowing it to travel at high speeds. And it was basaltic lava that killed those 300 people in Nyirangongo.
The secondary effect of volcanoes are lahars, landslide and tsunamis. Lahars occur when lava and mud mix travelling down the sides of the volcano. It can gather rocks of varying sizes and travel with more swiftness downhill. In 1985 Nevado Del Ruiz, Colombia eruption happened which led to lahars forming that were 40m deep it rushed downhill at 50 Kph engulfing the town of Armero, 50km away under 8 meter of mud, more than 22,00 people were killed. Landslide also take place because the eruption can trigger small
Volcanoes can pose different type of hazards separating into primary and secondary. Primary being the ash and dust, lava flow, volcanic gases and pyroclastic flow. How each one threatens the people live varies because ash and dust can disrupt transport therefore having an effect on any aid which may need to be brought in via planes. Also it can cause breathing problem due to high concentration of carbon and dioxide and sulphur gases found that erupt from the volcano. Pyroclastic flow is dense destructive mass of hot ash lava fragments and gases which are ejected in an explosion from a volcano and they travel at great speeds and destroy anything in its way. The image shows a pyrolcastic cloud. Lava can be disputed to be a secondary effect however in the eruption of Mount Nyirangongo 300 people were killed by lava travelling at more than 30 Kph in 1986. Although lava usually travels at relatively slow speed, basaltic lava which has low silica content therefore reducing the lava's weight and increasing its viscosity hence allowing it to travel at high speeds. And it was basaltic lava that killed those 300 people in Nyirangongo.
The secondary effect of volcanoes are lahars, landslide and tsunamis. Lahars occur when lava and mud mix travelling down the sides of the volcano. It can gather rocks of varying sizes and travel with more swiftness downhill. In 1985 Nevado Del Ruiz, Colombia eruption happened which led to lahars forming that were 40m deep it rushed downhill at 50 Kph engulfing the town of Armero, 50km away under 8 meter of mud, more than 22,00 people were killed. Landslide also take place because the eruption can trigger small