The small amount of carbon dioxide in Earth's atmosphere
A. causes ice to melt.
B. causes some of the sun's energy to be radiate to outer space.
C. raises the average temperature of Earth about 30°C (60°F) higher than if the carbon dioxide was absent.
D. None of these statements is correct.
Answer: C
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Oxygen, O2, is certainly good for you. Does it follow that if small amounts of oxygen are good for you, then large amounts of oxygen would be especially good for you?
A. Yes. Increased oxygenation of the bloodstream is good for you and can increase your life span. B. No. Large amounts of oxygen will absorb hydrogen from the body and increase the amount of water in the body causing an imbalance in electrolytes. C. Yes. This is the reason patients are given pure (100%) oxygen during medical procedures. D. No. Breathing 100% oxygen for extended periods of time can be damaging to the body.
A 2500-N pile driver ram falls 10 m and drives a post 0.1 m into the ground. The average impact force on the ram is
A) 2500 N. B) 25,000 N. C) 250,000 N. D) 2,500,000 N.
Why is a longer historical record of peak discharge preferred for a given river when determining the
statistical recurrence interval for flood events? What will be an ideal response?
Which of the following locations experienced the highest temperature increase during the period from 1950-2014?
A) Australia B) Contiguous United States C) North Central Canada D) Southeast Asia