Disasters CT 2 Flashcards
What are the 4 plate boundries? What do they look like? What natural hazards do they produce and why? Destructive
Destructive Plate Margins: They occur when and oceanic crust meets a continental crust.
What are the 4 plate boundries? What do they look like? What natural hazards do they produce and why? Constructive
Constructive Plate Margins: Most commonly where two plates move apart.
What are the 4 plate boundries? What do they look like? What natural hazards do they produce and why? Conservative
Conservative Plate Margins: Plates move relative to each other, but a crust is neither made or destroyed.
What are the 4 plate boundries? What do they look like? What natural hazards do they produce and why? Collision
Collision Plate Margins: Where two continental plates colide.
How are earthquakes caused?
Earthsquakes happen when two blocks of the earth suddenly slip past one another. The surface where they slip is called the fault or the fault plane.
How are earthquakes measured?
Earthquakes area measured on the Moment Magnitude Scale (MMS) or (MW). The scale goes from 0-10. It measures the total amount of energy released by the earthquake.
Was the 2010 Haiti earthquake a natural disaster?
The Haiti earthquake is a natural disaster because it left the country in ruins. With approximately 3 million people affected by the 2010 Haiti earthquake, it is considered as the most devastating natural disaster ever to be experienced in Haiti.
How do volcanoes form on plate boundaries and hot spots?
Volcanoes form when one tectonic plate moves under another. Usually a thin oceanic plate moves under a thicker continental plate. Then when enough magma builds up in the magma chamber, it forces its way up to the surface and erupts, often causing volcanic eruptions.
How can volcanoes be classified? Active
An active volcano is on e that has erupted recenty, and there is the possubility that it may eruprt again.
How can volcanoes be classified? Dormant
A dormant volcano is one that has not erupted for a long time, however, it may still erupt in the future.
How can volcanoes be classified? Extinct
An extinct volcano is one which has erupted thousands of years ago, but it will probably never erupt again.
What happened in Montserrat in 1997?
In 1997 Montserrat had a volcanic eruption which killed 19 people. It burried the capital city of Montserrat, Plymouth and after it had lost half of its population from people fleeing. The country was left in a mess as most of their money came from tourism but because of the eruption no people came so they needed help from the UK and France.
What are some of the features of a volcano?
Crater, main vent, volcanic bombs, lava flow, cone, side vent, magma chamber, ash, secondary cone, steam, layers of hardened rock and ash and ash cloud
