Florida International University
Department of Earth Sciences
GLY 1010: Introduction to Earth Science
Practice Quiz (Not for credit)






1. Molten rock beneath the Earth's surface is called __________.
A.granite
B.lava
C.lithosphere
D.magma


2. What is the name for a basaltic lava flow that has a ropy, folded surface?
A.aa
B.breccia
C.pahoehoe
D.tuff


3. Which of the following statements about lava is true?
A.The viscosity of a lava increases as the silica content decreases.
B.High temperature lavas are less viscous than low temperature lavas.
C.The more gas a lava contains, the less violent the eruption.
D.All of the above.


4.       

In the basalt sample depicted above, the vesicles (small spherical cavities) most likely formed by ______.
A.the escape of gas bubbles dissolved in the lava during the eruption
B.the weathering and erosion of olivine crystals after the eruption
C.air bubbles entrained in the flow during the eruption
D.vaporization of sea water during underwater eruption


5. Rocks formed from large, angular pyroclastic fragments are called volcanic ______.
A.breccias
B.conglomerates
C.domes
D.tuffs


6. Solidified fragments of volcanic material ejected into the air are called ______.
A.phenocrysts
B.vesicles
C.pillow basalts
D.pyroclasts


7. Which of the following volcanic deposits is most likely to form from a felsic lava?
A.pahoehoe
B.flood basalt
C.volcanic dome
D.shield volcano


8. A volcano that consists of both lava flows and pyroclastic deposits is called a ______.
A.stratovolcano
B.shield volcano
C.cinder cone
D.volcanic dome


9. The largest and most violent volcanic eruptions are associated with ______.
A.shield volcanoes
B.fissure eruptions
C.cinder cones
D.resurgent calderas


10. Which of the following volcanoes is a composite volcano?
A.Mt St Helens
B.Mauna Loa
C.Iceland
D.Yellowstone


11. Which of the following lava types erupts in sheets from fissures to build a lava plateau?
A.andesite
B.basalt
C.rhyolite
D.All of the above.


12. Huge mudflows made up of wet volcanic debris are called ______.
A.calderas
B.diatremes
C.tuffs
D.lahars


13. What type of volcanic gases form aerosols in the upper atmosphere that can cause global cooling?
A.carbon dioxide
B.nitrogen
C.sulfur dioxide
D.water vapor


14. In which of the following tectonic settings do most of the Earth's active volcanoes occur?
A.convergent plate boundaries
B.divergent plate boundaries
C.transform plate boundaries
D.intraplate settings


15. What types of lavas are erupted at mid-ocean ridges?
A.andesites
B.basalts
C.rhyolites
D.All of the above.


16. The Cascade volcanoes are associated with a __________.
A.convergent plate margin
B.divergent plate margin
C.transform plate margin
D.hot spot


17. Which of the following volcanoes is not associated with a convergent plate boundary?
A.Fujiyama
B.Kilauea (in Hawaii)
C.Mt. Pinatubo
D.Mt. St. Helens


18. Which of the following is least likely to signal an impending volcanic eruption?
A.earthquakes
B.gas emissions
C.tsunamis
D.swelling of the volcano


19. Which of the following states has the most active volcanoes?
A.Alaska
B.Florida
C.New York
D.Texas



This is the end of the test. When you have completed all the questions and reviewed your answers, press the button below to grade the test.