Which of the numbered features is a lahar?
A) 1
B) 2
C) 3
D) 4
E) 5
E) 5
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Which of these air pollutants was not regulated by the Clean Air Acts of 1970, 1977, and 1990?
A. CO2 B. CO C. SO2 D. NO2
Mixing
Refer to the figure below.
How many metres thick is the mixing depth?
A. about 0 m B. about 100 m C. about 200 m D. about 400 m
Which association is incorrect?
A) mesocyclone — region of tornado formation B) tornado watch — a tornado has been sighted on the ground C) downdraft — precipitation D) anvil - front of the thunderstorm
Earthquakes along the San Andreas fault zone, for example, are repetitive—they reoccur in roughly the same regions over and over again—separated by decades or centuries because ________
A) plate boundaries move at regular rates so the interactions across plate boundaries are predictable and regular B) stress continues to build up all the time and when it is great enough to overcome friction there will be an earthquake and then the process will start over again C) there are areas that are weak and always break when small amounts of energy are applied to them D) faults are always moving or creeping so an earthquake will occur whenever two sides meet that have the right properties for an earthquake