A decrease in the levels of ozone in the ozone layer:
a. may be related to human use of chlorofluorocarbons.
b. is not a cause for concern to humans because the ozone layer is in the stratosphere.
c. cannot possibly be related to any human activities.
d. is completely unrelated to the incidence of skin cancers in humans.
A
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Which of the following is not a property of metal?
A. is strong, but can be bent B. conducts electricity C. does not conduct heat well D. is shiny E. All of the above are properties of metals.
Earth's surface receives more solar radiation near the equator than at the poles. This uneven heating of Earth's surface produces
A. winds. B. day and night. C. dry air at the equator. D. clouds.
Complete the following nuclear equation: Bi ? Tl +?
A) e B) He C) gamma ray D) both A and B E) none of the above
Which country contains the world’s second largest number of Muslims?
a. Pakistan b. Bangladesh c. India d. Afghanistan e. Nepal