Tropical shelves and ________ contribute about the same percentage to the world marine fishery
A) coastal systems
B) coral reefs
C) nontropical shelves
D) the open ocean
E) upwellings
E
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Producing steel from recycled scrap iron uses _______________% less energy than producing steel from virgin iron ore
Fill in the blanks with correct word
Radiation inversions
A) lead to substantial vertical mixing of air. B) typically dissipate just after sunrise. C) have the greatest impact on pollution in the late afternoon. D) originate at the surface.
In a mercury barometer, atmospheric pressure can be measured in units of
A) time. B) velocity. C) length. D) force. E) mass.
Although ________ forms naturally in the stratosphere, when produced near the surface it is considered a pollutant with many negative effects
A) nitric acid B) ozone C) smog D) sulfur dioxide