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Flashcards in Volcano Deck (11)
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what is a volcano?

An opening in earths crust through which magma has reached earths surface.

1

What is Magma

Molten rock inside the volcano

2

Lava

Molten rock outside volcano

3

What is an ACTIVE volcano

A volcano the erupts regularly

4

What is a DORMANT volcano

A volcano that has erupted in the past but now is quiet

5

What is an extinct volcano?

Volcano that hasn't erupted in historical times
-no written record of an eruption

6

What is a seamount?

Underwater volcano

7

How many currently active volcanoes around the world are there?

500

8

Shield Volcano characteristics

Produces magma rich in iron and magnesium
-very liquidy lava- flows a long way
-not very explosive eruptions
-largest volcano
----Hawaiian volcanos----

9

What is a composite volcano? And what are some characteristics

Made of alternation layers of ash, cinders and lava
-thick magma rich in silica, full of trapped gases
-eruptions alternate between lava flows and explosive activity producing cinders and ash

10

Name some characteristics of cinder come volcanos

Smallest and most abundant type of volcano.
--violent eruptions
- a lot of ash and lava are thrown from opening and land surrounding volcano
--active for short period of then then go extinct