The sum of all the underlying causes can push a slope to the brink of failure, and then an immediate cause may trigger the movement. The immediate causes for mass movements include ________.
A. the construction projects of humans
B. thawing of frozen ground
C. heavy rains
D. earthquakes
E. All of these choices are correct.
Answer: E
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How is atmospheric nitrogen converted to a usable form in the biosphere?
A) Atmospheric nitrogen is directly available to plants and animals. B) Atmospheric nitrogen is completely unavailable to plants and animals and, as a result, synthetic fertilizers must be used. C) Bacteria within root nodules of legumes chemically combine the atmospheric nitrogen into nitrates and ammonia. D) It is absorbed into plants via stomata and converted within the plant to a usable form.
What type of evidence have scientists collected and studied from deep ice cores that shows a correlation between changes in global climate with methane and carbon dioxide levels?
A. Bivalve fossils B. Layers of volcanic ash C. Variations in ice layer color and thickness D. Bubbles of atmospheric gases
Which resource is most commonly used to produce electricity in the United States?
A. Oil B. Water C. Coal D. Gas
What is the elevation of the floor of the wind gap? What is the elevation of the valley to the north of the wind gap (the same valley that Braddock Run and Wills Creek run through)?
What will be an ideal response?