Organic material in sediment layers is dated by measuring the amount of radioactive ________ present.
A. oxygen
B. sodium
C. hydrogen
D. uranium
E. carbon
Answer: E
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Match the directional cleavage with the correct mineral
A) cleavage in three directions at 90° angles. B) cleavage in two directions at 90° angles. C) cleavage in one direction. D) cleavage in four directions. E) cleavage in three directions not at 90° angles. F) cleavage in two directions not at 90° angles. 12) Fluorite 13) Calcite 14) Halite 15) Hornblende 16) Feldspar 17) Muscovite
All of the following can be converted into acids in the atmosphere except ________
A) NO B) N2 C) sulfur D) NO2
Which of the following is NOT true about GMOs?
A) Approximately 10 percent of all farmland, worldwide, is devoted to GMO crops. B) Over 75 percent of all foodstuffs Americans consume has GMO products. C) North America produces around 50 percent of all GMO foods. D) The NAFTA nations, the United States, Canada, and Mexico have embraced the idea of labeling GMO foods. E) Africa is reluctant to adopt GMOs because it negatively influences their export opportunities to Europe.
Which ocean basin is the deepest on average?
A. Pacific B. Indian C. Atlantic D. Arctic E. None of these is correct.