The materials within polar stratospheric clouds cause ozone to be destroyed through their presence
What will be an ideal response?
This is correct. Chlorofluorocarbons, nitrogen oxides, and other compounds do
lead to ozone destruction, and can do so only because they are present in the stratosphere.
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Significant Figures: What is 56 + 
written with the correct number of significant figures?
A. 62.8 B. 62.812 C. 62.81 D. 63 E. 62.8123846
Mercury is visible to us:
A. only in the summer. B. only in the winter. C. only very briefly near sunrise or sunset. D. only during its new phase. E. only during the several hours around midnight
A tire pressure gauge reads 30 psi when the atmospheric pressure is 14 psi. The net force on 2 square inches of the tire is
a. 28 lbs. b. 32 lbs. c. 60 lbs. d. 88 lbs. e. none of these.
A single slit of width 0.0300 mm is used to project a diffraction pattern of 500 nm light on a screen at a distance of 2.00 m from the slit. What angle does the central maximum subtend as measured from the slit?
a. 
b. 
c. 
d. 
e. 