What are planetesimals?

A. Asteroids too small to be planets
B. Proto-planets formed by accretion
C. Very large planets
D. Very small planets


Answer: B

Environmental & Atmospheric Sciences

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Tropospheric aerosols

A) have residence time of at least several centuries. B) have the net effect of reducing global temperatures. C) form a positive feedback loop with increasing atmospheric carbon dioxide. D) are rarely anthropogenic in origin.

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What is the driving force for surface currents?

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What best describes what happens when an acid such as HCl is mixed with water?

A. A hydroxide ion from the water is transferred to the HCl molecule to form a proton and hydronium ion. B. The proton chemically bonded to the chlorine is transferred to a water molecule and forms a chloride ion and a hydronium ion. C. HCl is not an acid. D. A proton from the chlorine nucleus is ejected and captured by a water molecule to form a negatively charged HCl and a new hydronium ion. E. none of the above

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Which is NOT one of the geographic clusters of poverty in North America?

A) Appalachia B) the Deep South C) urban California D) agricultural California E) Canadian Maritimes

Environmental & Atmospheric Sciences