Small to moderate sized volcanoes formed of rhyolite above subduction zones are ___

Small to moderate sized volcanoes formed of rhyolite above subduction zones are ____.
a. shield volcanoes
b. cinder cones
c. lava domes
d. stratovolcanoes
e. resurgent caldera

Question 2

A caldera is formed ____.
a. when seawater reacts with hot basalt
b. in volcanoes which do not have enough steam pressure to support solidified magma
c. from pyroclastic flows
d. when volcanoes form in freshwater lakes
e. by the collapse of a magma chamber

Question 3

A low, bowl-shaped crater encircled by a low rim is a(n) ____.
a. pahoehoe
b. aa
c. maar
d. lahar
e. pumice

Question 4

Pyroclastic flows are dangerous because they ____.
a. contain poisonous sulfur compounds
b. cause magma chamber collapse
c. move very fast, and extend a long distance
d. move very fast over a short distance
e. move at unpredictable speeds

Question 5

Pumice is ____.
a. created in explosive eruptions involving viscous magma and high amounts of volatiles
b. the solidified form of a lahar that has reached the sea
c. compacted volcanic ash
d. clinkers of basalt formed in slow lava flows
e. created in slow eruptions involving fluid magma and low amounts of volatiles

Question 6

Basaltic lava flows that are charged with little steam and crystallize before reaching the surface are called ____ lava.
a. pahoehoe
b. maar
c. aa
d. lahar
e. pumice

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Small to moderate sized volcanoes formed of rhyolite above subduction zones are ____.

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