At Yellowstone National Park, caldera-forming eruptions have produced:Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer.aRhyolitebAndesitecBasaltdBoth rhyolite and basalt, as an example of what is called 'bimodal' volcanism.eNone of the above.
Question
At Yellowstone National Park, caldera-forming eruptions have produced:Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer.aRhyolitebAndesitecBasaltdBoth rhyolite and basalt, as an example of what is called 'bimodal' volcanism.eNone of the above.
Solution
The correct answer is d. Both rhyolite and basalt, as an example of what is called 'bimodal' volcanism.
Here's why:
Yellowstone National Park is known for its volcanic activity. The park sits on a hotspot where light, hot, molten rock from the mantle rises toward the surface. While the Yellowstone hotspot is now under the Yellowstone Plateau, it previously helped create the eastern Snake River Plain through a series of huge volcanic eruptions.
The term 'bimodal' volcanism refers to the occurrence of both mafic (basaltic) and felsic (rhyolitic) lavas in the same volcanic field. Basalt and rhyolite are two types of volcanic rock with different compositions - basalt is rich in iron and magnesium, while rhyolite is rich in silica.
In Yellowstone, this bimodal volcanism is evident. The park has experienced three major eruptions, all of which produced rhyolite lavas. However, basaltic lavas are also found in Yellowstone, but they are less common and tend to occur in smaller volumes than rhyolitic lavas.
Similar Questions
Stratovolcanoes, like Mt St. Helens and Mt. Rainier, formed through hydration melting and produce magmas that are intermediate in composition. Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer.aTruebFalse
Select all correct answers: The volcanic rocks in the Pinnacles National Park:Multiple answers:Multiple answers are accepted for this questionSelected answers will be automatically saved. For keyboard navigation...SHOW MOREaWere erupted by a volcano ~23 million years ago. bWere 'cut' by the San Andreas Fault and moved northward away from their original location.cWere formed by decompression melting of the mantle asthenosphere during Yellowstone hot spot volcanism in California. dForm rugged spires or pinnacles in the landscape because the volcanic breccia is more resistant to erosion than the surrounding sedimentary rock.eAre the nesting grounds for the California condor.
Magma that is ejected during a volcanic eruption forms _____ igneous rocks.
The Sierra Nevada batholith formed due to:Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer.aContinental hotspot volcanism and caldera formationbFlood basalts that formed during subduction of the Pacific plate under the North American platecCrystallization of granodioritic plutons above a Mesozoic subduction zonedFriction melting associated with the Neogene movement of the San Andreas faulteNone of the above
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