Discuss the concept of the graded stream. Do most streams approximate a graded stream? Why or why not?
What will be an ideal response?
A graded stream is one in which the channel slope has adjusted so that the stream velocity is just enough to transport the sediment load. In other words, the stream is at a dynamic equilibrium between aggradation and degradation. An individual stream can have both graded and ungraded portions. This is actual the rule and not the exception. Disturbances in the drainage basin can disrupt this equilibrium.
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The spill of cyanide into the Tisza and Danube Rivers in 2000 could have been prevented if
a. the computer systems monitoring the cyanide volume had not crashed b. fewer people had withdrawn water from the rivers so the overall flow rate was lower c. an earthquake warning system had been in place to warn dam managers of the impending quake that broke the dam d. the mining company had installed a stronger containment dam and a backup settling pond to prevent leakage e. a newer, more technologically sound settling pond had been in place
Where is the safest place, among those listed below, in the 48 contiguous states with respect to
earthquake seismic risk? a. South Dakota b. Missouri c. South Carolina d. Maine e. Utah
Effective environmental leaders believe that their actions ________
A) have no impact on the environment B) matter C) can do nothing because they are only one person D) cannot be changed E) are superior to others
Which crevasse will form parallel to the terminus as a glacier moves over a change in slope?
A) Bergschrund B) Longitudinal C) Transverse D) Moulin