Which of the following serves as a sunscreen for the planet by blocking 95% of the sun's ultraviolet (UV) radiation and is not considered an air pollutant?
A. ozone in the stratosphere
B. ozone in the troposphere
C. carbon dioxide in the stratosphere
D. sulfur compounds from volcanoes
Answer: A
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What does the Gender Equity measure?
A) ratio of male to female college graduates B) ratio of male to female students enrolled in primary and secondary schools C) ratio of male to female wages D) ratio of male to female survival rates E) ratio of male to female wages AND ratio of male to female survival rates
Which rock layer is the oldest in this image?
What will be an ideal response?
According to research, how high has sea level risen since 1870?
A) 7 cm B) 10 cm C) 1 cm D) 25 cm