The most common gas in the atmosphere is
A. methane (CH4).
B. oxygen (O2).
C. carbon dioxide (CO2).
D. nitrogen (N2).
Answer: D
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Indicate whether the statement is true or false.
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A) Forest B) Rainforest C) Grassland D) Desert E) Wetland
What mineral precipitates at travertine springs to create formations?
A) sulfates B) sulfites C) calcite D) halite
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