When air in a filled balloon escapes and the balloon flies across the room, the force that accelerates the balloon is
A. atmosphere surrounding the balloon.
B. air that rushes out of the opening.
C. escaping air pushing back on the balloon.
D. none of the above
Answer: C
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Why does iron, when added to quartz, cause the purple color of amethyst?
A) The presence of trace constituents can affect color. B) Iron overpowers the silicon in quartz. C) Amethyst is formed under extremely hot conditions. D) Iron is red and silicon is blue, making purple.
No region of Indonesia has a Christian majority
Indicate whether the statement is true or false
Which of the following is a synthetic greenhouse gas?
A) water vapor B) methane C) oxygen D) nitrogen E) chlorofluorocarbons
All of the following are a common source of indoor air pollution EXCEPT
A. Smoke from tobacco products B. Volatile organic compounds C. Ozone D. Radon