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

Environmental & Atmospheric Sciences

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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.

Environmental & Atmospheric Sciences

____________________ ____________________ air masses often form over northern mainland Canada

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences

Sediment deposited by glacial meltwater is:

a. a tarn. b. better sorted than ice-contact deposits. c. tephra. d. clay. e. roche moutonnée.

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences