Volcanic activity on Venus is thought to be:
A) more frequent, but less violent than volcanic activity on Earth.
B) more frequent and more violent than volcanic activity on Earth.
C) less frequent, but more violent than volcanic activity on Earth.
D) less frequent and less violent than volcanic activity on Earth.
E) the same as volcanic activity on Earth.
C
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This photograph shows a small portion of the Sun's photosphere. What is going on in the bright regions (such as the bright region indicated by the arrow)?
A) Hot gas is rising up from the solar interior. B) Cool gas is falling back down into the solar interior. C) The bright spots are regions of unusually intense magnetic fields. D) The bright spots are what we call sunspots.
When scrap iron in a boat is thrown overboard in a swimming pool, the pool level
A) rises. B) falls. C) remains unchanged.
All people come very close to being able to float in water. What therefore is the volume (in cubic meters) of a 50-kg woman?
a. 0.007 b. 0.035 c. 0.050 d. 0.070 e. 0.085
Radio telescopes have poor resolving power because
a. their diameters are so large. b. the energy they receive is not electromagnetic radiation. c. radio waves have long wavelengths. d. a and b e. none of the above