Briefly explain the advantages and disadvantages of phytoremediation as a method of removing or detoxifying hazardous wastes
What will be an ideal response
Advantages:
Easy to establish.
Inexpensive.
Can reduce material dumped into landfills.
Produces little air pollution compared to incineration.
Low energy use.
Disadvantages:
Very slow (can take several growing seasons).
Effective only to depth of plant roots.
Toxic chemicals may evaporate from leaves.
Plants used can be toxic to animals.
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One important reason we do not know much about the geologic history of the Precambrian is that ________
A) the climate was so harsh that erosion removed most of the rocks that formed during the Precambrian. B) rocks did not exist during much of that time C) radioactivity was not measurable during the Precambrian D) there are very few fossils preserved in Precambrian rocks E) we have not yet been able to establish the half-lives for radioactive elements that existed in the Precambrian
Referring to the diagram below, which of the following options states the name of the front and the position of the coldest air?
?
A. stationary front, with coldest air at 1 B. stationary front, with coldest air at 2 C. occluded front, with coldest air at 1 D. occluded front, with coldest air at 2
Which of the following is true of oil?
A) Oil was not produced in the United States until the middle of the twentieth century B) Oil was a minor resource until the diffusion of motor vehicles early in the 1900s C) Oil was discovered by Baron von Drusenberg of Austria in the later eighteenth century D) Libya has the world's largest proven oil deposits E) The United States imports about 5 percent of the total annual oil it consumes
Why do you think the freshwater in the ice sheets is generally considered
unavailable for human use? What will be an ideal response?