Evidence that there is a considerable amount of water frozen under the surface of Mars is provided by all of the following except
A. satellite measurements of water in the polar caps.
B. discovery by the Mars rovers of chemicals in surface rocks formed in the presence of large amounts of water.
C. squishy-looking flow patterns around crater impact sites.
D. features resembling channels cut by flowing water.
E. periodic eruptions of geysers when subsurface ice is melted by volcanic activity.
Answer: E
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Sunspots are known to be magnetic phenomena because
a. Doppler shifts in spectral lines are observed. b. the Zeeman effect is observed in sunspots. c. collisional broadening is observed in spectral lines. d. infrared observations indicate that the sunspots are cooler than their surroundings. e. observations during eclipses reveal a very extensive photosphere.
Suppose that large jovian planets had never formed in our solar system. Which of the following would most likely be true?
A) Neither the asteroid belt nor Oort cloud would exist. B) Earth would have suffered far fewer impacts. C) There would be a large empty region in our solar system between the orbit of Mars and the Kuiper belt. D) Earth would orbit much closer to the Sun.
Which of the following is an inert gas?
A) Hydrogen B) Helium. C) Carbon D) Oxygen
A fused combination of a diverging and converging lens pair, each made from a different index of refraction glass, is used to reduce the occurrence of which of the following effects?
a. mirages c. chromatic aberration b. light scattering d. spherical aberration