What occurs in a pan of water placed outdoors on a warm day?
A) evaporation
B) condensation
C) both of these
D) neither of these
Answer: C
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_______________ occur when tides caused by the Sun and Moon partially cancel out
Fill in the blank(s) with correct word
Relative to the focal length of a wide-angle camera lens, the focal length of a telephoto lens is
A) shorter. B) the same. C) longer. D) Any of theses choices could be correct, depending on the camera.
What happens to the visible light radiated by stars located within a dusty gas cloud?
A) It is absorbed by dust, which heats the dust grains so that they emit the absorbed energy as infrared light. B) It is blocked by dust and its energy is thereby lost. C) It is reflected by dust back to the star from whence it came. D) It passes through the cloud unaffected.
From what do stars form?
A. black holes B. interstellar clouds C. open clusters D. planetary nebulas E. globular clusters