Subsistence farmers are able to increase food supply by

A) participating more regularly in periodic markets.
B) producing cash crops for revenue to purchase food.
C) intensifying production through increased labor supply and the addition of new techniques.
D) slash and burn agriculture.
E) switching to livestock grazing.


Answer: C

Environmental & Atmospheric Sciences

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Which of these numbered features contains most of Earth's water?



A) 1 Oceans
B) 2 Atmosphere
C) 3 Glaciers and ice sheets
D) 4 Groundwater
E) 5 Lakes

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The Alpine orogeny was caused by

a. the collision of the African plate with the Arabian Plate. b. the collision of the African plate with the Australian plate. c. the collision of Africa and Arabia with Eurasia. d. the collision of India with Asia. e. none of the above

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The Southern Oscillation refers to a change in surface pressure over the south Atlantic Ocean

Indicate whether the statement is true or false

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Which of the following pairs of reagents is now used industrially to synthesize PET poly(ethylene terephthalate)?

A) ethylene and dimethyl terephthalate B) ethylene glycol and dimethyl terephthalate C) ethylene and terephthalic acid D) ethylene glycol and terephthalic acid

Environmental & Atmospheric Sciences