Which of the following is a gas at room temperature and pressure?

A) butane
B) hexane
C) pentane
D) none of them


A

Environmental & Atmospheric Sciences

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Human blood contains which of the following buffers?

A) H2CO3/HCO3- B) H2PO4-/HPO42- C) both a and b D) neither a nor b

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What was the first orogeny to affect the Appalachian mobile belt?

a. Acadian b. Taconic c. Cordilleran d. Alpine e. Caledonian

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In igneous rocks with porphyritic texture, the larger minerals are phenocrysts, and the smaller minerals

collectively make up the groundmass. Indicate whether the statement is true or false.

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The North American craton

A. has only 1,000-2,000 meters of sedimentary rock overlying basement rock B. has rock beneath any sedimentary rock that is old plutonic and metamorphic rock C. covers the central part of the United States and Canada D. All of these choices are correct.

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