Since levees can protect many areas during floods, why are they controversial? What will be an ideal response?
In addition to being expensive, levees in many cases make problems worse, by restricting the flow of
water that otherwise would have spread over a floodplain
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What is the function of an analysis mask in raster data operations?
What will be an ideal response?
You observe a fish-eating osprey bird with its chicks near Everglades National Park. What commonly used pesticide nearly caused the extinction of this and other large predatory bird species in the 1970s?
A) Malathion B) Round Up C) DDT D) Pyrethroids
Which of the following parts of the carbon cycles shows the most active movement of carbon between spheres?
A) Atmosphere and biosphere B) Cryosphere and biosphere C) Atmosphere and hydrosphere D) Hydrosphere and atmosphere
Which of the following is true?
A) Lightning results from the buildup of electrical energy within clouds or between the cloud and the ground. B) Thunder is caused by rapid contraction of the air. C) The majority of lightning strikes occur over the oceans because of high rates of evaporation and friction. D) Lightning is relatively uncommon on the Earth. E) Thunder is caused by rapid cooling of the air.