Why are master joints so important?
What will be an ideal response?
Answer: These are the longest joints around, sometimes extending for considerable distances horizontal and vertically. Because these represent major zones of weakness for weathering, weathering proceeds fastest along the master joints. The spacing of the master joints determines much landscape development and the placement of topographic features such as the location of stream valleys.
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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
Which type of soil is generally reddish in color from iron oxides?
a. andisol b. histosol c. inceptisol d. laterite e. gelisol
Biodegradable plastics may incorporate ________ to speed breakdown processes.
A. Weak structural components B. Water C. Cornstarch D. Special types of hydrocarbons E. Microscopic tears in the plastic
Which of the following is false as regards the jet streams?
A) The polar jet stream and subtropical jet stream may appear over North America simultaneously. B) The polar jet stream can migrate as far south as Texas, steering colder air masses into North America. C) They weaken during each of the hemisphere's summer and strengthen during its winter. D) The pattern of ridges and troughs causes variations in jet stream speeds. E) They have no known effect on surface weather systems.