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Which statement is NOT accurate about volcanoes? A. All volcanoes have or have had lava or magma B. There are some volcanoes that are inactive C. All volcanoes are mountains D. Shield volcanoes are safer to live near than composite volcanoes An island arc of volcanoes is most likely caused by A. divergent oceanic plates. B. divergent continental plates. C. convergent continental and oceanic plates. D. convergent oceanic plates Imagine that you discover an ancient volcano. The outer shell of the volcano was eroded away, leaving a solid central vent of rock. What kind of rock would you expect the vent to be made of? A. igneous B. marble C. sandstone D. sedimentary Which of the following is NOT evidence of an impending volcanic eruption? A. growing pressure on rocks near a volcano B. frequent small tremors C. a rise in rock temperature D. a long period of inactivity What type of volcano is shown in the above drawing? A. caldera B. composite C. dome D. shield Why are cinder cone volcanoes more dangerous than shield volcanoes? A. Cinder cone volcanoes are usually bigger than shield volcanoes. B. Shield volcanoes tend to release more gases. C. Cinder cone eruptions are more explosive. D. Lava from cinder cone volcanoes is hotter than lava from shield volcanoes. A volcanic eruption can affect the atmosphere by A. reducing the amount of water vapor in the atmosphere B. adding large quantities of several gases, such as sulfur dioxide, to the atmosphere. C. clearing away nearby clouds, thus increasing the amount of sunshine D. increasing the amount of oxygen by reducing the amount of plant life Which type of volcano would be least explosive? A. cinder cone B. stratovolcano C. shield volcano D. composite volcano The table above lists the gases coming from a modern Hawaiian volcano. If ancient volcanoes gave off the same gases, which gas would have been most helpful in the development of early life-forms that could carry out photosynthesis? A. N2 B. SO2 C. CO2 D. Cl2 Matter thrown out of the crater of a volcano is called A. magma B. quasi-nova C. ejecta D. supplemental lava What type of volcano is shown in the above drawing? A. caldera B. composite C. dome D. shield
