What is by far the greatest threat to human health on a global basis?
A. AIDS
B. poverty
C. dengue fever
D. malaria
E. industrial chemicals
Answer: B
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Which type of agriculture is practiced by the largest percentage of the world's people?
A) hunting and gathering B) shifting cultivation C) pastoral nomadism D) intensive subsistence E) plantation
Which of the following best describes renewable energy resources?
A) They currently supply 20% of the Earth's electricity. B) They contribute only 70% as much greenhouse gases as fossil fuels do. C) They have been largely ignored by the Obama administration. D) They are unsuitable for the economies of developing nations.
____________________ ____________________ air masses often form over northern mainland Canada
Fill in the blank(s) with correct word
Sediment deposited by glacial meltwater is:
a. a tarn. b. better sorted than ice-contact deposits. c. tephra. d. clay. e. roche moutonnée.