An erupting vent through which molten rock surfaces
A mountain built from magmatic eruptions
Characteristics of materials produced by eruptions
three forms; lava flows, pyroclastic debris, and volcanic gases
molten rock that moves over the ground.
1. Low silica/high Fe and Mg
2. moderate silica, Fe and Mg
3.high silica, low Fe and Mg
Examples of Low Silica/High Fe and Mg
Examples of moderate silica, Fe, and Mg
examples of high silica, low Fe and Mg
silicic, felsic, rhyolitic
fragments blow out of a volcano
vapor and aerosols that exit a volcano
The character of a lava flow dedpends on the viscosity of the lava erupts. lava is less viscous than lava and thus flows out as a __.
basaltic, rhyolitic, thin sheet
Which of the following is not a form of lava?
aa, andesite, lapilli, pahoehoe
Which of the following statements is true of low viscoisty lava?
1. could build a shield volcano
2. is typically basalt
3. has low silica content
4. all of the above are true
all of the above are true
True/ False, volcanos erupt lava, pyroclastic debris and gas.
a volcanic mudflow and debris flow
Mafic lava erupted at a submarine will produce
which of the follwoing statements about rhyolite lava is true?
1. has more silica than basalt lava
2. indicates the tendency for explosive activity
3. forms broken adn blocky surfaces and may form a lava dome above the vent
4. all of the above statements are true.
All of the above are true.
What are tectonic boundaries along volcanics?
mor, convergent boundaries, continental rifts, and hot spots.
huge sheets of low viscosity lava
Most subaerial volcanoes lie at a divergent plate boundary, true or false
pyroclastic flows bring instant death to any life caught in them, true or false
What measurable clue indiates that particular volcano may erupt in the near future
the volcano changes shape as the magma chamber fills