Ozone
A) is formed mainly in the troposphere where it diffuses to the stratosphere.
B) is only formed through natural processes.
C) is destroyed by halogens in chlorofluorocarbons.
D) is only destroyed through natural processes.
C) is destroyed by halogens in chlorofluorocarbons.
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A natural process which threatens life and property is known as a natural _______________.?
Fill in the blank with correct word.
Which statement about arsenic is false?
A)It is odorless and tasteless. B)It contaminates groundwater via natural processes. C)It harms the nervous system and may cause birth defects. D)Reducing the amount of arsenic in water will increase the cost of water. E)Arsenic concentrations are uniform across the U.S.
Which air mass forms over North America only in summer?
A) mT B) mP C) cT D) cP
Global warming and climate change are the same thing.
Answer the following statement true (T) or false (F)