What is a sun pillar and how is it formed?
What will be an ideal response?
Answer: Platelike crystals between a low Sun and an observer can also reflect (as opposed to refract) sunlight off their tops and bottoms to produce sun pillars. The many ice crystals are aligned almost, but not exactly, horizontally, with each reflecting a portion of the incoming light differently to produce the apparent columns stretching upward and downward from the Sun.
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The questions of ________ and ________ are among the biggest problems in cleaning up hazardous waste sites.
A. Appropriate technology; location B. Degree of purity required; appropriate technology C. Appropriate technology; liability D. Liability; degree of purity required E. Location; cost
While climate influences every agricultural practice, the form of agriculture most dependent on climate is
A) Mediterranean. B) mixed crop and livestock farming. C) dairy farming. D) grain farming. E) livestock ranching.
Which of the three modern global change problems discussed in this chapter-- global warming, ozone depletion, or loss of biodiversity--do you consider to be the most serious?
Give reasons for your answer. If you wish, include information drawn from other sources. What will be an ideal response?
The 90° angle solar rays are striking the Tropic of Cancer on ________
A) March 21 B) September 21 C) December 21 D) June 21