chapter 5

LaGarita, in the San Juan Mountains, is an example of a ____________. a. Yellowstone-type caldera b. basalt plateau c. Hawaiian-type caldera d. Crater Lake-type caldera e. crater

a. Yellowstone-type caldera

which of the following can be a product of a composite volcano eruption? (choose all that apply) a.cinders b. andesitic lava c. volcanic bombs d. gases e. ash

all of the above a.cinders b. andesitic lava c. volcanic bombs d. gases e. ash

which of the following is a feature of an aa flow? a. aa flows can develop lava tubes b. aa flows have sharp, jagged edges c. aa flows have low viscosity d. aa flows can change into pahoehoe lava e. aa flows can produce pillow lavas

b. aa flows have sharp, jagged edges

__________ is/are common in the final stages of growth of a typical shield volcano. a. pahoehoe lava b. high viscosity (rhyolitic) lava c. lava tubes d. low viscosity (basaltic) lava e. pillow lava

b. high viscosity (rhyolitic) lava

which type of volcanic hazard can decrease global temperatures? a. lava flow b. volcanic ash c. tsunami d. pyroclastic flow e. lahar

b. volcanic ash

Which of the following would decrease the viscosity of magma? a. a decrease in water content b. a decrease in dissolved gases c. a increase in temperature d. a decrease in the slope of the volcanic flank e. an increase in silica content

c. an increase in temperature

which of the following indicates that a volcanic eruption could be imminent? a. a decrease in seismic activity b. a newly-formed depression in the volcano c. an increase in atmospheric temperature d. a decrease in surface temperatures e. a change in the composition of gasses being released

e. a change in the composition of gasses bein released

All types of volcanic cones share which feature? a. broad, gentle slopes b. pahoehoe lava c. caldera d. lava tubes e. conduit

e. conduit

most magma on Earth is produced at ________ plate boundaries. a. oceanic-oceanic convergent b. transform c. continental-continental convergent d. continental-oceanic convergent e. divergent

e. divergent

which volcanic landform listed below is primarily composed of loose fragments of scoria? a. the Yellowstone caldera b. the Deccan Traps flood basalts c. the Fujiyama composite volcano d. the Mauna Loa shield volcano e. the Paricutin cinder cone

e. the Paricutin cinder cone