Which of the conditions below would most likely produce warming at the earth's surface?
a. increase the amount of low-level global cloudiness
b. increase the amount of sulfur-rich particles in the stratosphere
c. decrease the energy output of the sun
d. increase the amount of global snow cover
e. increase the amount of high-level global cloud cover
e
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What type of rocks can usually be found in mountain stream environments?
a. Arkose b. Conglomerate c. Travertine d. Breccia e. Both b and d
Which of the following does NOT happen to water when salt is added?
A. Density decreases B. Freezing point decreases C. Boiling point increases D. All of these are correct. E. None of these is correct.
Irreversible changes in ecological systems caused by human activities that result in large scale environmental changes are causing those systems to experience an ecological __________ point.
Fill in the blank(s) with the appropriate word(s).
To denote the luminosity of stars, as a reference, astronomers use the luminosity of
A. the cluster of stars at the center of the Milky Way galaxy. B. the Sun. C. the Northern Star. D. Proxima Centauri, our solar system's closest neighbor star.