By volume, which of the following are the most abundant gases in the Earth's atmosphere?

A. nitrogen and oxygen
B. carbon dioxide and nitrogen
C. oxygen and water vapour
D. oxygen and helium


Answer: A

Environmental & Atmospheric Sciences

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Subducting oceanic crust underneath oceanic crust will produce ________

A) hot-spot volcanic islands B) volcanic island arcs C) continental volcanic arcs D) mid-ocean ridge

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Indicate whether the statement is true or false

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Estuaries containing different mixtures of fresh and saltwater throughout most of their length are: a. salt wedge estuaries

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