Stabilizing banks is an important component of stream restoration. Which of the following is NOT a method of bank stabilization?
A. Supporting with tree trunks
B. Supporting with rock walls
C. Adding soil so that the slope is at least 45 degrees
D. Using mulch
E. Using rocks
Answer: C
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Streams are important natural resources. How do humans use the water withdrawn from streams?
What will be an ideal response?
Imagine that local lawmakers have introduced a land use ordinance that limits the outward growth of the city in order to minimize sprawl. Do you agree with this action?
a. Yes. Limiting urban sprawl will lead to a revitalized urban center. b. Yes. This ordinance will protect the natural landscape and ecosystems that surround the city. c. No. The ordinance would violate the rights of land owners. d. I’m not sure. I can see both positive and negative consequences from such an ordinance.
A jack system will increase the potential energy of a heavy load by no more than 1000 J with a work input of 2000 J. The efficiency of the jack system is no more than
A) 10 percent. B) 20 percent. C) 50 percent. D) 80 percent. E) not enough information given
One benefit of offshore wind farms is that ________
A) maintenance costs are less than they are on land B) unlike land-based wind farms, they do not interfere with bird migration routes C) wind speeds are higher and turbulence is lower over water than over land D) they are more aesthetically pleasing than wind farms on land E) costs to erect the turbines are lower, and land does not need to be purchased