Which of the following elements has the most valance electrons in its outermost shell?

A) carbon
B) nitrogen
C) oxygen
D) helium

Answer: C

Environmental & Atmospheric Sciences

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The fact that the trees in central Alaska look like the trees in western Siberia, despite being separated by thousands of kilometers, illustrates the theory of

A) convergent evolution. B) multiple origins. C) global dispersal. D) plate tectonics.

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Which of the following locations would have the lowest average air pressure?

a. sea level, anywhere on the planet
b. challenger deep, mariana trench, lowest point in the ocean
c. dead sea, israel, lowest point on earth's land surface
d. summit of mount everest, tallest mountain on earth

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Gust fronts help create shelf clouds

Indicate whether the statement is true or false

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Who proposed the idea of seafloor spreading?

a. Harry Hess b. Frederick Vine c. Oliver and Sykes d. Fred Taylor e. Hess and Matthews

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Environmental & Atmospheric Sciences