Of the following ingredients, which one is not important for thunderstorm development?
Answer: Strong pressure gradient force
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The spectra of most stars are dark-line spectra because ________
A) elements in the Sun's outer atmosphere absorb in these dark-line bands, blocking the radiation in those bands B) electrons decaying to a lower energy state emit a photon at a fixed energy, leaving dark bands between the emissions C) elements in the Sun's outer atmosphere emit radiation between these dark bands D) elements in the earth's atmosphere absorb in these dark-line bands, blocking out the frequencies in the dark bands
The word geography comes from the Greek, meaning ________
A) the study of rocks B) description of Earth C) planet measurement D) drawing of maps E) the study of human culture
What is a main hazard of shield volcanoes?
a) hot fragments thrown a short distance from the volcano b) burning, building collapse, and suffocation from widely distributed pyroclastic material c) destruction by moderately fluid lava flows that can flow far from the volcano d) volcanic mudflows and landslides e) relatively small pyroclastic eruptions caused by localized explosions or collapse
A thin math book and a thick science book are joined by a string on a horizontal friction-free table. One book is pushed off the edge of the table. As it falls, the other book (different mass) is dragged horizontally across the table surface. Acceleration of the books is
A. between zero and g. B. g. C. zero. D. g/2. E. greater than g.