The most important function of the ozone layer in the stratosphere is
A. conversion of oxygen to O3.
B. absorption of incoming UV radiation from the sun, that otherwise would increase the risk of skin cancer.
C. maintenance of the Earth's magnetic field.
D. destruction of CFCs, that otherwise would accumulate in the atmosphere and cause increased incidence of lung cancer.
Answer: B
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Landslides, rock falls, and floods illustrate
A) that Earth is made of rock. B) that Earth is very old. C) that Earth is dynamic. D) that the crust of Earth is stationary and static.
Which of the following is not considered among the greatest anthopogenic threats to biodiversity?
A) habitat loss B) introduction of non-native species C) air, water, and soil pollution D) climate change E) habitat loss, non-native species, pollution, and climate change all represent threats to biodiversity
A Hertzsprung-Russell diagram (H-R Diagram) is a plot of ________
A) brightness versus temperature B) size versus color C) color versus brightness D) size versus brightness E) temperature versus color
The specific humidity of air changes when there is a change in
A. the temperature of a parcel of air. B. pressure of a parcel of air. C. the addition or removal of water vapor. D. All of these choices are correct.