Volcanic ash ____.
a. is so small that it does no damage if inhaled
b. is carried so high into the atmosphere that it does not have much effect on the area near an eruption
c. has a large effect near an eruption, but little effect further away
d. is composed of aerosols formed from the reaction of gasses and water vapor
e. is a major disruption to transportation and evacuation
Question 215. The danger of volcanic ash is increased when ____.
a. it is composed of hydrogen sulfide compounds
b. the volcano creates rain, making building collapse more likely
c. dry conditions allow it to collapse quickly to form tuff
d. it contacts and melts snowbanks, resulting in flash floods
e. the flammable ash comes into contact with fire or high heat
Question 3Pyroclastic flows ____.
a. can be protected against in the basement of structures
b. are rarely generated in volcanic eruptions
c. move slowly enough to be avoided
d. cannot move across bodies of water
e. can reach temperatures so hot that they glow
Question 4The most dangerous poisonous gas(ses) associated with volcanic activity ____.
a. is hydrogen sulfide
b. are invisible but detectable by smell
c. must be breathed to cause damage
d. can weaken buildings by reacting to form sulfuric acid
e. can mix with moisture to make dangerous aerosols
Question 5Lava flows ____.
a. move so slowly that they do not present a danger to either life or property
b. are often redirected by emergency efforts
c. can be redirected only with long-term planning and construction
d. move fast and are a threat to life and property
e. move slowly enough that they are usually a threat only to property
Question 6A surge is a(n) ____.
a. upthrust in a lava dome
b. increase in pressure on a magma chamber
c. emission of poisonous gas
d. wave of steam associated with pyroclastic flows
e. increase in volcanic activity in a geographic area
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