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Question
In the oceans, sulfur exists primarily as ________, and in rocks and sediments sulfur occurs mostly as ________ and ________.A) hydrogen sulfide (H2S) / gypsum (CaSO4) / elemental sulfur (So)
B) hydrogen sulfide (H2S) / sulfate (SO42-) / elemental sulfur (So)
C) sulfate (SO42-) / gypsum (CaSO4) / pyrite (FeS2)
D) sulfate (SO42-) / sulfide (H2S) / elemental sulfur (So)
Answer
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