Eruption Types
Hawaiian eruptions are characterized by what type of magma flowing?
Basaltic
increased acidity caused by SO2 and NO2 gases in eruption cloud, falling precipitation
Flowing liquid rock on the surface from a volcanic vent or crater
Lava
What Washington volcano erupted violently in May 1980?
Mt. St. Helens
What secondary effect solidified and buried some people of pompeii
Ash and pumice
Which eruption type is the most violent and potentially destructive?
Plinian (Vesuvius)
The origin of lava and definition of a dormant or active volcano
Magma chamber
What is pyroclastic material?
Material that is ejected from a volcano, can include ash, gases, lava, and rock fragments.
What town was destroyed by Mt. Vesuvius in AD79?
Pompeii
Why would a landslide be a secondary effect
E.Q's and tremors can loosen rocks and cause landslides.
increased rainfall, lahars
Which eruption is associated with a fissure volcano - mid ocean ridge
Icelandic
What is a Lahar?
A volcanic mudslide, triggered by hot temps instantly melting mountain ice and snow accumulation into water
What is the ejected material which contains liquid lava surrounded by hardened rock and explodes on impact?
Lava bomb
What year did Mt. Vesuvius erupt violently (most famous)
AD79
The vertical portion of the ash cloud ejected from the central vent or volcano's crater?
Eruption column
What is associated with both a vulcanian and plinian eruption?
tephra
ash deposits
lava flows
pyroclastic flows
lava bombs
lava blocks
lahar and maybe landslides
What causes a pyroclastic cloud to move down the volcano's sides?
Gravity
What is the cause for tremors and earthquakes around the volcano?
Magmatic movement before, during and after an eruption
What type of eruption was Mt. St. Helens?
Laterial blast, flank eruption (side ways)
Another word for ash falling and depositing on the surface
Cinders
Which eruption type includes less pyroclastic material however erupts frequently
Fissure
Which natural event can trigger an eruption?
Tremor and/or earthquake
The Greek word for ash cloud
Tephra
What year did Krakatoa erupt and create weather changes all across the world, killing 35,000 people?
1883
Which potentially dangerous secondary effect cuases aquatic life to diminish?
increased acidity of aquatic environments caused by acidic concentrations of ash and deposits