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
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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
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
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.
What is the driving force for surface currents?