How can certain composite volcanoes (stratovolcanoes) become significantly life-threatening without
actually erupting or by undergoing only a minor eruptive event local to its summit? What will be an ideal response?
Heating up the summit of a snow and ice-capped volcano can produce lahars that can be very deadly,
as illustrated by the case of Columbia's Nevado del Ruiz in 1985. A comparatively minor volcanic
event on the summit of that mountain melted snow and ice that produced lahars that killed thousands
of people. Mount Rainier in Washington State is considered to be a danger in this respect. Prehistoric
lahars covered areas to the north of it that are currently heavily populated
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What is an accretionary wedge?
A) Deformed and thrust-faulted continental lithosphere B) A fan of sediments at the bottom of a deep-ocean trench C) Sediments and ocean crust fragments being scraped off of a subducting plate D) Fault blocks that are slipping down due to extension in a back-arc basin
Which of the following greenhouse gases is also destroying the ozone layer?
A) Carbon dioxide (CO2) B) Chlorofluorocarbons (CFCs) C) Methane (CH4) D) Nitrous oxide (N2O) E) Water vapor
Assume that an air parcel is moving with a constant speed of 10 m/s and along a straight line. A new, single force acts on it in the same direction than the parcel is moving in. What will happen to the air parcel?
a. It will continue moving at 10 m/s. b. It will curve towards the right. c. It will move faster. d. It will gradually slow down and stop.
Assuming that all other conditions are identical, a slope that is ________ is more stable.
A. more steeply inclined B. more nearly vertical C. more gently inclined D. Slope angle has nothing to do with slope stability.