What is the "greenhouse gas" that is the most significant cause of what scientists have labeled global warming?
a. nitrogen dioxide
b. hydrogen peroxide
c. ferrous oxide
d. carbon dioxide
d
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At which of the following heights does the greatest variation in daily temperature usually occur?
A. at ground level B. at the level where thermals stop rising C. at the top of a high-rise apartment building D. about 2 metres above the ground
Parabolic mirrors ________ sunlight on a collecting medium.
A. deflect the most B. selectively reflect the brightest C. focus intense D. selectively focus the brightest E. diffuse intense
If the earth's orbit around the Sun were more elliptical than now with the same inclination angle
A) the northern hemisphere would be warmer. B) the southern hemisphere would be about the same in yearly temperature. C) storms in both hemispheres would be stronger. D) there would be no change because the Sun's energy is constant.
Which of these are present in an element's nucleus?
A. electrons and protons B. neutrons C. neutrons and protons D. electrons