Exam 9: The Wrath of Vulcan: Volcanic Eruptions

Pele's hair ________.

Which volcanic hazard poses the greatest threat to humans?

What magma properties would most likely lead to the formation of a shield volcano?

Of the three primary forms of subaerial volcanoes,________ have the most gently sloping sides,due to the low viscosity of the basaltic lavas that form them.

The difference between accretionary lapilli and pumice lapilli is that ________.

The characteristic "rotten egg" smell of many active volcanoes is derived from ________.

A passive eruption that primarily forms lava flows and minor scoria is termed a __________________ eruption.

Of the three primary forms of subaerial volcanoes,________ consist of a cone-shaped pile of tephra often formed in a single eruption.

A large,violent,explosive eruption is termed a __________________ eruption.

Which of the following does NOT influence whether an eruption will produce lava flows or pyroclastic debris?

______________ are snowball-like lumps of ash formed when ash mixes with water in the air and then sticks together to form small balls.

How do volcanic eruptions affect global average temperatures on the Earth?

Describe how explosive eruptions occur.Make sure to address viscosity,gas content,and the process for building pressure.

What are the three main types of volcanoes? How is the shape of a volcano related to its eruptive style?

The style of eruption depends on the plate tectonic setting in which the volcano is situated.Compare the different eruption styles you would observe at a divergent versus a convergent plate boundary.Make sure to address the role composition,viscosity,and gas content play in your answer.

A mixture of air,hot ash,and pumice lapilli that rushes down the side of a volcano in a scalding avalanche is termed a(n)________.

Common volcanic gases include the following:

Volcanologists and geologists monitor volcanoes to determine whether or not an eruption is imminent.Which of the following is not a typically used monitoring technique?

Nonviolent eruptions characterized by extensive flows of basaltic lava are termed ________.

Basaltic lavas that have rough,rubbly surfaces are called ________.