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NS140 Chapter 8

ha ha.

QuestionAnswer
Which of the following conditions are ideal for magma formation? high temperature, low pressure, and the presence of water
What are the processes behind the formation of magma at spreading centers? As the lithospheric plate separates, the asthenosphere moves upward. Decreasing pressure melts the surrounding rock, forming less dense magma that moves to the surface.
A series of volcanic islands formed within a tectonic plate rather than at a tectonic boundary. These islands most likely formed via _______. mantle plumes
A geologist finds a slab of andesite, which forms from the interaction of granitic and basaltic magma. What can the geologist infer about andesite's silica content? Andesite has more silica than basalt but less than granite.
Which of the following statements is correct regarding how partial melting affects the formation of basaltic magma? Partial melting of the asthenosphere, composed of peridotite, results in silica-enriched basaltic magma.
Which of these is NOT a valid hypothesis for how tectonic processes formed the continents? tectonic melting
Which of the following statements can be said of granitic magma? Granitic magma forms from the melting of the continental crust.
Where are some of the largest quantities of magma formed? subduction zones
Which of the following best describes a pluton? solidified granitic magma that has solidified in Earth's continental crust
An archaeologist studying the eruption of Mount Vesuvius in 79 CE asks a geologist about the type of magma involved. The geologist explains that the eruption was most likely composed of _________. liquid granitic magma
In what tectonic environment did the Hawaiian Islands form? within a tectonic plate
A geologist hiking in an area without active volcanism finds a tall, wedge-shaped granite formation exposed by wind erosion. What volcanic feature does this likely represent? stock
Which of the following is the most important factor in distinguishing aa and pahoehoe lava? viscosity
A geologist finds a large basaltic aa lava feature from the side of a composite cone volcano, formed over a long period. What likely explains how this feature was formed? a fissure eruption
Among the following options, which describes a cinder cone? a small volcano composed of pyroclastic fragments
A caldera formed 100,000 years ago in North America has filled with water and is now a recreational lake. Despite a multiyear drought, the lake level is rising. What does this likely indicate about the caldera? There is an active mantle plume beneath the caldera.
Geologists are assessing whether an active volcano is going to erupt. Which is NOT a sign that magma may be rising to the surface? Nearby hot springs have decreased in temperature.
Which of the following describes a caldera? a collapsed magma chamber resulting in a circular depression
Which of the following is NOT how magma is produced in a subduction zone? Pressure increases in the subduction zone.
Which of the following is NOT correct regarding different volcano types? A cinder cone is also called a stratovolcano.
Created by: robynlee
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