Warm air aloft is associated with constant pressure surfaces that are found at ____ altitudes than normal and ____ normal atmospheric pressure aloft
a. higher; higher than
b. higher; lower than
c. lower; higher than
d. lower; lower than
e. lower; the same as
ANSWER: a
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In the U.S., ________ account for 1/4 of GDP and 30% of total exports
Fill in the blank(s) with correct word
Symbiotic archaea that live inside tubeworms can use two different methods to metabolize ________ and can switch back and forth to accommodate fast-changing environmental conditions
A) arsenic B) cadmium C) carbon dioxide D) hydrogen sulfide E) sulfuric acid
Which two geologic processes result from vertical circulation within the mantle?
a. The upwelling of hot rock at trenches results from the mantle's downward circulation, while the subduction of oceanic plates along oceanic trenches results from the mantle's upward circulation. b. The upwelling of hot rock along oceanic ridges results from the mantle's downward circulation, while the subduction of oceanic plates at trenches results from the mantle's upward circulation. c. The upwelling of hot rock along oceanic ridges is the result of the mantle's upward circulation, while the subduction of oceanic plates at trenches is the result of the mantle's downward circulation. d. The subduction of hot rock along oceanic ridges results from the mantle's downward circulation, while the upwelling of oceanic plates at trenches results from the mantle's upward circulation. e. The upwelling of hot rock along oceanic ridges is the result of the mantle's upward circulation, while the subduction of oceanic plates at trenches is the result of the mantle's downward circulation.
The ____________________ marks the northernmost migration of the sun's vertical rays
Fill in the blank(s) with correct word