Which of the following materials will react with an acid to produce a gas?
A) NaOH(aq)
B) Na2CO3(aq)
C) both a and b
D) neither a nor b
B
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The U.S. Department of Agriculture has become increasingly concerned about soil erosion, because expansion of agricultural activities between 1982 and 1992 resulted in sharp increases in rates of soil erosion loss from farmland.
Answer the following statement true (T) or false (F)
Antarctic bottom water has a very narrow range of both salinity and temperature; this water is nearly homogeneous.
Answer the following statement true (T) or false (F)
What is this bowl-shaped, glacially carved feature?
A) Hanging valley
B) Arête
C) Cirque
D) Continental ice sheet
Which of the following energy sources provides the greatest share of renewable energy consumed in the U.S.?
A. conventional hydropower B. geothermal power C. solar energy D. wind energy