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