One major way in which chlorofluorocarbons can enter the stratosphere is ____
A) from the exhaust of high-altitude aircraft
B) in an inversion
C) in building thunderstorms that penetrate into the lower stratosphere
D) from the rupture of radiosonde balloons
C
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Which of the following is not one of Latin America's best farming areas?
A. alluvial soils along the Amazon River B. pampas of Uruguay and Argentina C. lava-based soils in southern Brazil
The process of herding and domesticating aquatic animals is known as
A) aquaculture. B) agriculture. C) processing. D) artisanal fishing.
The aquatic ________ were porpoise-like reptiles, which probably gave birth to live young. Fill in the blank(s) with the appropriate word(s)
The Earth's magnetic field has reversed itself many times in the geologic past. Indicate whether the statement is true or false