The world's potentially farmable land is estimated to be about ________ the present cultivated area
A) twice
B) four times
C) eight times
D) sixteen times
E) thirty-two times
A
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One characteristic of waste-to-energy incineration is that it ____.
A. is inexpensive to build B. produces no hazardous waste C. produces no air pollution D. concentrates hazardous substances into ash E. discourages waste production
Which is NOT a proposed geoengineering solution to mitigate climate change?
a. increasing the storage of carbon in land b. increasing the storage of carbon in oceans c. increasing the storage of carbon in the lower atmosphere d. planting additional trees e. injecting aerosols into the atmosphere
What happens to levels of polar wildflower pollen in sediments during an ice age?
A. decreases B. stays the same C. increases
A weather map symbol of a line containing only semicircles that are all located on one side of the line depicts a(n) ____
a. warm front b. occluded front c. stationary front d. cold front e. squall front