Mount St. Helens is...a. A basaltic cinder coneb. An explosive stratovolcanoc. A basaltic shield volcanod. A small, welded tuff cone


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Which one of the following shows the correct order (left to right) of decreasing magma viscosity?a. Rhyolite, andesite, basaltb. Andesite, rhyolite, basaltc. Basalt, rhyolite, andesited. Basalt, andesite, rhyolite
Which of the following are usually the most abundant gases emitted during basaltic volcanism?a. Chlorine and sodiumb. Neon and ammoniac. Oxygen and nitrogend. Water vapor and carbon dioxide
Which of the following statements best describes Shiprock, a famous volcanic feature in New Mexico?a. The eroded remains of a volcanic pipe and radiating dikesb. An extinct, massive, rhyolite volcanic domec. A very recently, active basaltic cinder coned. An extinct, highly symmetrical, composite volcanic cone
A _______________ is the largest, discordant body of intrusive, igneous rock.a. Lopolithb. Laccolithc. Batholithd. Stock
_____________ magma is the most abundant type erupted at oceanic spreading centers. a. Graniticb. Basalticc. Andesiticd. Pegmatitic
The _______________ ocean basin is rimmed by the most subduction zones. a. Atlanticb. Indianc. Pacificd. Arctic
Which of the following is associated with deep mantle hot spots?a. Vesuvius and the other volcanoes of Italyb. The volcanoes of Hawaii and the Quaternary activity in Yellowstone National Parkc. The very young cinder cones scattered across the southwestern United Statesd. Mt. St. Helens and other volcanoes of the Cascade Mountains
Which type of basaltic lave flow has a fairly smooth, unfragmented, ropy surface?a. Aab. Pegmatiticc. Pahoehoed. Scoria
The Columbia Plateau in Washington and Oregon is...a. A thick stack of welded-tuff layersb. An extensive, thick accumulation of successive eruptions of flood basaltsc. A caldera filled with rhyolitic lave flowsd. A field of large stratovolanoes
What volcanic events formed Crater Lake, Oregon? When did it take place?a. A powerful explosion blew away the top of a stratovolcano; 10 million years agob. The crater of a large, extinct cinder cone filled with water; 5 million years agoc. Landslides and volcanic mudflows dammed the Mazama River; 500 years agod. Caldera collapse followed major ash and pyroclastic flow eruptions; 6000 years ago
The average composition of rocks comprising a large composite cone or stratovolcano is similar to a (an) ________ magma.a. Basalticb. Ultramaficc. Andesiticd. Rhyolitic
Massive, gently sloping volcanoes built successive, basaltic lave flows are called ___________. Examples are found on the Hawaiian Islands. a. Shield volcanoesb. Composite/Stratovolcanoesc. Cinder conesd. Volcanic domes
Volcanic bombs originate...a. As erupted magma blobs that partly congeal before falling to the groundb. As laser-guided, granite blocks launched from a supersonic jetc. As blocks of volcanic rock broken off from an erupting volcanic craterd. As ash particles that join together in the eruptive plume and fall as cobble-sized objects
Which of the following factors tend to increase the explosive potential of a magma body beneath a volcano?a. High viscosity and high dissolved gas contentb. High viscosity and low dissolved gas contentc. Low silica content and low viscosityd. Low viscosity and low dissolved gas content
A ____________ is an intrusive, igneous body that is tabular and concordant (parallel) with adjacent rock layers.a. Laccolithb. Dikec. Plutond. Sill
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