Differentiation of planetary embryos results in denser ________ cores and less-dense ________ mantles
A) silicate, non-silicate
B) metallic, silicate
C) silicate, metallic
D) non-metallic, metallic
Answer: B
Environmental & Atmospheric Sciences
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How many electrons are gained or lost in the following half-reaction? 2 Na ? 2 Na+
A) 2 electrons are lost B) 1/2 electron is gained C) 1/2 electron is lost D) 2 electrons are gained E) 4 electrons are gained
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This type of fog is NOT the result of air cooling to the dew point:
A) radiation fog. B) advection fog. C) upslope fog. D) steam fog.
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The "altithermal" describes a cold period of Earth's history
Indicate whether the statement is true or false
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During the 19th century, as populations grew and urban environments expanded, humans had less exposure to ________
A) water B) chemicals C) animals D) natural environments E) air pollutants
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