The "ozone hole" is observed above ____
A) the equator
B) Australia
C) Antarctica
D) Asia
C
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Life as we know it could not exist without ____________________ in the stratosphere
Fill in the blanks with correct word
Other than ice sheets and glaciers, the largest repository of fresh water is located in
A) soil moisture storage. B) lakes and saline seas. C) rivers and streams. D) groundwater. E) atmospheric water vapor.
The U.S.-Canadian border was established
A) in its entirety by the Oregon Treaty of 1846. B) in its entirety along the 45th parallel. C) as an isogloss demarcating speech variations between Canada and the United States. D) without longitudinal geometric borders. E) through a series of treaties between the United States and the United Kingdom.
The assimilation of radiation by molecules of matter is
A) refraction. B) absorption. C) reflection. D) transmission.