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Flashcards in PC Nevada del Ruiz Deck (20)
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1

What type of volcano was nevada del ruiz?

composite

2

Where is nevada del ruiz?

Colombia in the northern andes

3

When was the eruption of NDR?

13th november 1985

4

Define the term lahar?

A landslide or mudflow of volcanic fragments

5

Define the the term lava?

Molten rock that reaches the earths surface through a volcano

6

Which plates are involved in the eruption?

Nazca Plate and the South American Plate

7

Which plate subducted under the other?

The Nazca

8

Why did the Nazca plate subduct?

Because it is a denser oceanic Crust

9

Which way were the 2 plates moving

the nazca was moving in an easterly direction and the south american in a westerly direction

10

Explain what happended after the nazca subducted?

The nazca plate subducted to about 200km and the pressure built up and at that point caused the crust to melt and form magma. it then was forced to the surface through a weak point (the volcano) and exploded through the top as ash and lava.

11

What did the lahar do?

The lahar was formed by the meltrd snow, ash and sulfur . It came down the volcano and was travelling 50km per hour. This is what destroyed the town.

12

How many people died in the eruption?

22,000

13

how deep was the lahar?

30 metres

14

Which towm was most effected by the eruption?

Amero

15

What caused the snow to melt?

The lava melted it

16

Describe where the town of amero is in relation to NDR?

50km from the volcano inthe bottom of a valley

17

What is a composite volcano?

A volcano layered with ash and lava

18

How high was the ash cloud?

8 km high

19

How long did it take the lahar to destroy Amero?

20 mins

20

What was the problem with it erupting at 1.09am

People were asleep and unprepared