Air is best described a(n)
A - mixture
B - particulate
C - chemical compound
D - element
E - colloid
A - mixture
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What is the main tenet of Plank's quantum hypothesis?
A) Energy comes in discrete packets of a certain minimum size. B) Energy is composed of subatomic particles called quanta. C) Energy is a continuum, but light is quantized. D) Energy can be converted into matter through nuclear quanta. E) Light is composed of waves that exist only at certain quantum fundamental frequencies.
The word "geography" comes from the Greek roots "geo" and "graph" and literally means ________
Fill in the blank(s) with correct word
Ocean currents in the Northern Hemisphere tend to rotate:
a. clockwise b. counterclockwise c. in an ocean eddy route d. around the North American Drift
Between 1960 and 2009, floods in the United States produced an average of ________ in damage per year.
A. $459,000 B. $66.76 million C. $459 million D. $4.59 million E. $6.76 billion