BK Nevado del Ruiz Flashcards
at what time did Nevado del Ruiz erupt?
1.09pm
What is lahar?
Lahar is when a volcano erupts and the molten lava mixes with the snow and ash.
Which crust subducts under the other into the mantle and at which depth?
The oceanic crust at around 200km
why did the oceanic crust melt once it reached 200km?
The pressure had increased high enough for it to melt.
define the term ‘composite volcano’.
A volcano with layers of compressed ash and solidified lava.
where is the Nevado del Ruiz?
South Columbia
How fast was the mudflow?
80km per hour.
Which town was effected by the eruption of Nevado del Ruiz?
Amero.
At what date did Nevado del Ruiz erupt?
13th November 1985
Which two plates collided with eachother to create the eruption?
The Nazca plate and the South American plate.
why didn’t the people from Amero evacuate from the area.
The people ignored the warnings from the sciantists.
what hazards come out of the volcano.
Lava and ash.
Why does the magma rise and how does it go up the volcano?
Because it melts it becomes less dense and therefore rises through a weak spot in the volcano.
how thick was the mudflow?
30m
Why was it hard to rescue people?
They were trapped in the mud and it was hard for the rescue people to come as they wern’t prepared and Amero is a valley making it hard for them to get there.
