Which of the following is the biggest single source of mercury in the ocean?
A) Producing acetaldehyde
B) Burning of coal
C) Disposal of mercury batteries
D) Leaching from rocks
E) Volcanic eruptions
B
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What is typically monitored at a landfill? What will be an ideal response?
The image below shows a beam of radiation passing between two electrically charged plates. 
Which of the beams is due to alpha particles?
A. a B. b C. c D. all of the above E. none of the above
Which of the following statements regarding the global oceanic ridge system is correct?
A) The ridge system marks the deepest locations on the Earth's surface. B) The ridge system marks the locations of most mantle plumes in the mantle. C) The ridge system is the longest topographic feature on the Earth's surface. D) The ridge system has an extensive submarine canyon system.
Which of the following minerals is not a chemical compound?
A) halite (NaCl) B) graphite (C) C) quartz (SiO2 ) D) pyrite (FeS)