As you increase in altitude, air pressure drops.
a. true
b. false
a. true
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How might a mineral deposit that previously could not be mined profitably be upgraded to an ore deposit?
The mineral deposit becomes less concentrated. The demand for the mineral decreases, raising its value. Older equipment is preferentially used in mining over newer equipment. The cost to extract a mineral increases. The demand for the mineral increases, raising its value.
On a weather map of the northern hemisphere, in which of the following locations are westerlies observed?
A. south of the tropical highs B. between the subpolar lows and the subtropical highs C. north of the subpolar lows D. between the doldrums and the horse latitudes
Cloud-to-ground lightning makes up what % of all lightning?
A) 10% B) 20% C) 25% D) 50%
A charged balloon neatly illustrates that something can have a great amount of
A) potential energy and a low voltage. B) voltage and a small potential energy. C) both voltage and potential energy. D) none of the above