Geology Exam 2 w/pictures Chapter 6
scoria cone, a lava fountain
Figure A shows a _____ (type of volcano) that forms from _____ (type of eruption). a. shield volcano, eruption of basaltic lava flows b. volcanic dome, eruption of viscous felsic lava c. scoria cone, a lava fountain d. composite volcano, eruption of lava and ash
shield volcano, eruption of basaltic lava flows
Figure B shows a _____ (type of volcano) that forms from _____ (type of eruption). a. shield volcano, eruption of basaltic lava flows b. volcanic dome, eruption of viscous felsic lava c. scoria cone, a lava fountain d. composite volcano, eruption of lava and ash
composite volcano, eruption of lava and ash
Figure C shows a _____ (type of volcano) that forms from _____ (type of eruption). a. shield volcano, eruption of basaltic lava flows b. volcanic dome, eruption of viscous felsic lava c. scoria cone, a lava fountain d. composite volcano, eruption of lava and ash
volcanic dome, eruption of viscous felsic lava
Figure D shows a _____ (type of volcano) that forms from _____ (type of eruption). a. shield volcano, eruption of basaltic lava flows b. volcanic dome, eruption of viscous felsic lava c. scoria cone, a lava fountain d. composite volcano, eruption of lava and ash
melting by adding water
For the letters on this figure, choose the likely cause of melting for site D. a. decompression melting as the mantle rises b. melting of continental crust caused by an influx of mantle-derived magmas c. melting by adding water
low-viscosity lavas
Long, thin lava flows are typically produced by a. low-viscosity lavas b. volatile-rich eruptions c. high-viscosity lavas d. collapsing eruption columns
conical
The typical shape of most volcanoes, including the one shown here is a. conical b. cylindrical c. domical
high-viscosity, felsic or intermediate, pumice
This figure shows an eruption of _____ (viscosity) magma that probably has a _____ (composition) and would form _____ (resulting rock type). a. high-viscosity, felsic or intermediate, pumice b. low-viscosity, nonvascular basalt, mafic c. high-viscosity, magic, pumice
high-viscosity, felsic or intermediate, rhyolite or andesite
This figure shows an eruption of _____ (viscosity) magma that probably has a _____ (composition) and would form _____ (resulting rock type). a. low-viscosity, nonvesicular basalt, mafic b. high-viscosity, felsic or intermediate, rhyolite or andesite c. high-viscosity, vesicular basalt, mafic
volcanic dome
This relatively small volcanic feature consists of solidified lava and some volcanic ash. What kind of volcano is it? a. shield volcano b. composite volcano c. volcanic dome
shield volcano
This volcano is broad and low, and is composed of basaltic lava flows. What kind of volcano is it? a. composite volcano b. shield volcano c. scoria cone d. caldera
scoria cone
This volcano is relatively small and composed of volcanic cinders. What kind of volcano is it? a. volcanic dome b. shield volcano c. scoria cone d. caldera
relatively small pyroclastic eruptions caused by localized explosions or collapse
What is the main hazard of this type of volcano? a. destruction by moderately fluid lava flows that can flow far from the volcano b. hot molten fragments thrown a short distance from the volcano c. relatively small pyroclastic eruptions caused by localized explosions or collapse d. viscous lava that moves too fast for people to outrun
hot fragments thrown a short distance from the volcano
What is the main hazard of this type of volcano? (scoria cone) a. hot fragments thrown a short distance from the volcano b. destruction by viscous lava flows that can flow far from the volcano c. volcanic mudflows and landslides d. relatively small pyroclastic eruptions caused by localized explosions or collapse
destruction by moderately fluid lava flows that can flow far from the volcano
What is the main hazard of this type of volcano? (shield volcano) a. hot fragments thrown a short distance from the volcano b. destruction by moderately fluid lava flows that can flow far from the volcano c. volcanic mudflows and landslides d. burning, building collapse, and suffocation from widely distributed pyroclastic material
pahoehoe lava flow
What type of basaltic feature is shown in this photograph? a. volcanic bomb b. a lava flow c. pyroclastic flow d. pahoehoe lava flow
eruption of viscous lava
What type of eruption formed the volcano in this photo? (volcanic dome) a. fluid lava flows b. eruption of viscous lava c. lava fountain d. eruption column
lava dome
What type of eruption is shown in this photograph? a. lava fountain b. lava dome c. lava flow d. pyroclastic flow
solidify and add land to an island
When lava flows reach the ocean, they a. explode and produce layers of ash b. solidify and add land to an island c. form tubes and continue flowing down to the deepest seafloor
1
Which of the numbered features is a lava flow? a. 1 b. 2 c. 3 d. 4 e. 5
locations A and B only
Which of the sites shown in this figure have decompression melting in an oceanic setting? a. A b. C c. B d. locations A and B only