A natural, meandering, river channel is modified into a more or less straight and smooth, canal-like channel. Which of the following statements is correct?
A) The straight channel has a higher gradient and more friction than the natural channel.
B) The natural channel had a lower gradient and higher friction than the straight channel.
C) The natural channel had a lower gradient and less friction than the modified channel.
D) All of the above statements are true.
B
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Physical methods for detoxifying hazardous wastes include
A. filtering with charcoal or resins to remove harmful solids. B. isolating the materials and placing them in safe storage. C. destroying toxic substances with bacteria and enzymes. D. activating chemical reactions to convert hazardous chemicals into harmless ones. E. using deep-well disposal.
The Khorat Plateau is composed of __________, and is found in ___________ Southeast Asia
A) granite; insular B) limestone; mainland C) volcanic soil; insular D) sandstone; mainland E) coral; insular
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a. dunes, ripples, antidunes, plane bed b. ripples, dunes, antidunes, plane bed c. dunes, ripples, plane bed, antidunes d. ripples, dunes, plane bed, antidunes
Which of the following is relates the name of an electrode to its sign?
A) The anode is the positive electrode. B) The cathode is the negative electrode. C) both a and b D) neither a nor b