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02 Aug 2008, 11:03
Kudos
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N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Building the Glenn Canyon dam on the Colorado river caused unforeseen
environmental effects. One of these is that, by preventing annual
floods, the dam prevents the river from stirring up sediments
collected on the river bottom and depositing them high on the banks of
the river. The deposited sediments are needed to create and maintain
sandbars, which form natural habitats for native fish. By releasing
water from the dam annually, we will flood the river and thus recreate
the sandbars normally found below the dam."
Which of the following must be true if the prediction of the land
management specialist above is also to prove true?
1. There are no other effects of the dam which will prevent the native
fish of the river from using the new sandbars below the dam.
2. The flood caused by massively releasing water from the dam will be
like a natural flood in every major respect.
3. The size of a sandbar on a river always stays the same or increases
after a flood.
4. Any other dams upriver from the Glen Canyon dam must also release
enough water to cause a flood in order for the flood from the Glen
Canyon dam to be successful.
5. The dam does not prevent the flow of sediments from upriver needed
to replenish the sediments that inevitably wash downstream over time.
environmental effects. One of these is that, by preventing annual
floods, the dam prevents the river from stirring up sediments
collected on the river bottom and depositing them high on the banks of
the river. The deposited sediments are needed to create and maintain
sandbars, which form natural habitats for native fish. By releasing
water from the dam annually, we will flood the river and thus recreate
the sandbars normally found below the dam."
Which of the following must be true if the prediction of the land
management specialist above is also to prove true?
1. There are no other effects of the dam which will prevent the native
fish of the river from using the new sandbars below the dam.
2. The flood caused by massively releasing water from the dam will be
like a natural flood in every major respect.
3. The size of a sandbar on a river always stays the same or increases
after a flood.
4. Any other dams upriver from the Glen Canyon dam must also release
enough water to cause a flood in order for the flood from the Glen
Canyon dam to be successful.
5. The dam does not prevent the flow of sediments from upriver needed
to replenish the sediments that inevitably wash downstream over time.
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02 Aug 2008, 12:01
Kudos
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spriya
OA is not A
