Glacial ice is
A) essentially the same as snow.
B) formed from continual accumulation of snow that recrystallizes under its own weight into an ice mass over a period of many years.
C) made of sedimentary rock.
D) generally less dense than snow and firn.
B
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What near-shore ocean deposit will be mined as land-based deposits are exhausted and we want to avoid declines in food production?
A. phosphorus B. sodium chloride C. diamonds D. gravel
If ethanol production in the United States continues to increase after 2015, it will need to rely on
A) even more corn that will not be available to feed the hungry people of the world. B) second-generation biofuel using enzymes that convert cellulose to fermentable sugar. C) manure and other animal wastes to generate methane, which in turn is used to produce alcohol. D) any plant material and enzymes that convert sugars into cellulose, methane, and oxygen.
Heat exchange between a moving air mass and the surface beneath it is at its maximum when the temperatures of the two are equal
Indicate whether the statement is true or false
When water freezes, its density
A) decreases. B) remains the same as in the liquid state. C) increases. D) decreases until -4° C, then increases. E) is indeterminant due to hydrogen bonding.