List some regions of the U.S. where there are significant populations living on alluvial fans. Why is it dangerous to build there?
What will be an ideal response?
ANSWER: Hundreds of thousands of people live on gravelly alluvial fans in Los Angeles, Palm Springs, Phoenix, Tucson, Salt Lake City, Denver, and elsewhere. Most of these fans were built up from fast-moving slurries of sand, gravel, and boulders (debris flows). Even arid regions can have periods of intense or prolonged rainfall. People who live on such fans are at considerable risk from debris flows.?
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The agent of transport that produces colluvium is
A. wind. B. running water. C. gravity. D. glacier.
Natural gas is primarily composed of ________
A) sulfur dioxide B) oxygen C) methane D) nitrogen E) nitrite
What type of foliation results from the parallel alignment of abundant, coarse-grained, mica flakes in a metamorphic rock?
A. Phyllitic structure B. Schistosity C. Slaty cleavage D. Gneissic banding