Why is very humid air near the surface a necessary ingredient for severe thunderstorms?
A) High humidity makes the air more dense.
B) Lapse rates are larger in humid air.
C) High humidity makes the rising air cool more rapidly.
D) High humidity strengthens the cold front.
E) More latent heat is then available as energy for the storm.
E
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What is a factor that is instrumental in shaping an erosional coast?
A) Wind-driven grit abrasion B) Stream erosion C) Dissolution of acids and bases D) All of these choices
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
Construction of the Three Gorges Dam in China has resulted in
A. inundation of only a trivial amount of farmland, because it is sited in a narrow gorge walled with granite bedrock. B. increased damage from the frequent flooding of the Yangtze River. C. displacement of more than 1.3 million people. And increased seismic and landslide activity in the area. D. improved stability in banks of the Yangtze River downstream as a result of increased sediment load.
An erosion pavement is caused by water running off the land surface instead of seeping in and carrying soil particles away with it.
Answer the following statement true (T) or false (F)