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Volcanoes (what is a volcano? (parts of a volcano (magma chamber (magma is…
Volcanoes
what is a volcano?
it's a crack in the earth's crust
parts of a volcano
magma chamber
magma is molten rock mixed with gas and water vapour
main chimney
crater
cone of the volcano
secondary cones
when a volcano erupts
lava
runny lava
sticky lava
fragments of rocks (ashes /lapilli)
types of volcanoes depending on activity
avtive/alive
dormant /sleeping
extinct or dead
two types of eruptions
effusive
characterized by fluid lava
lava comes out in a quiet
it flows quickly
explosive
characterized by viscous lava
lava is rich in gas
it flows slowly
two types of cones
shield volcano
stratovolcano
in Italy
13 active areas
with Iceland the largest concentration of active volcanoes in Europe