Which of the following molecules is(are) polar?
A) CH3Cl
B) CH2Cl2
C) both of them
D) neither of them
C
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John James Audubon described a single flock of ____ of perhaps a billion birds, which took three days to travel past him and darkened the skies.
A. Carolina parakeets B. starlings C. sparrows D. passenger pigeons E. California condors
Why is carbonic acid the most abundant acid in chemical weathering?
A) Carbon dioxide is present in the atmosphere and in soil; it combines with water vapor in the atmosphere and water percolating through soil to produce weak carbonic acid. B) Carbon dioxide easily breaks down to carbonic acid. C) Carbonic acid is so good at chemical weathering that it appears all the time. D) Acetic acid is rare, so carbonic acid is common.
The temperature of rising air parcels ________ as they move upward
A) remains constant B) decreases C) increases D) may either increase or decrease
The _______________ of a rockfall is the distance it will travel
Fill in the blank with correct word.