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9. Mars has distinct surface feature-related regions. Which of the 20. Short-period comets have orbital periods of
following is not such a region? a. less than 200 years.
a. Volcanic b. more than 200 years.
b. Systems of canyons c. variable duration but between 10 and 100 years.
c. Plateaus near the poles d. variable duration but between 100 and 200 years.
d. Ocean floors 21. Remnants of comets and asteroids found in space are called
10. How many moons orbit Mars? a. meteoroids.
a. One b. meteors.
b. Two c. meteorites.
c. Four d. minor planets.
d. None 22. Meteorites are classified into the following groups except
11. What is the largest planet in our solar system? a. iron.
a. Mars b. stony.
b. Jupiter c. lead.
c. Saturn d. stony-iron.
d. Earth 23. The most widely accepted theory on the origin of the solar
12. Callisto, Europa, Gannymede, and Io are system is
a. Galilean moons. a. big bang.
b. volcanoes on Jupiter. b. conservation of matter.
c. red spots. c. protoplanet nebular.
d. comets that struck Jupiter. d. collision of planets.
13. The density of Jupiter is 24. The belt of asteroids between Mars and Jupiter is probably
a. 50 percent greater than that of Earth. a. the remains of a planet that exploded.
b. 50 percent that of the density of Earth. b. clumps of matter that condensed from the accretion disk but
c. 25 percent that of the density of Earth. never got together as a planet.
d. 500 times the density of Earth. c. the remains of two planets that collided.
14. The only moon in the solar system with a substantial d. the remains of a planet that collided with an asteroid
atmosphere is or comet.
a. Io. 25. Which of the following planets would be mostly composed of
b. Moon. hydrogen, helium, and methane and have a density of less than
3
c. Phobos. 2 g/cm ?
d. Titan. a. Uranus
15. Saturn’s rings are thought to be b. Mercury
a. composed of thousands of particles of various sizes. c. Mars
b. the remains of a collision with Jupiter. d. Venus
c. preventing the atmosphere on Saturn from escaping. 26. Which of the following planets probably still has its original
d. made up of captured asteroids. atmosphere?
16. The planet with the lowest average density, which is less than that a. Mercury
of liquid water, is b. Venus
a. Uranus. c. Mars
b. Neptune. d. Jupiter
c. Saturn. 27. Venus appears the brightest when it is in the
d. None of the above is correct. a. full phase.
17. The planet that is not a giant is b. half phase.
a. Saturn. c. quarter phase.
b. Neptune. d. crescent phase.
c. Mercury. 28. The small body with a composition and structure closest to the
d. Uranus. materials that condensed from the accretion disk is a (an)
18. What planets are considered “twins”? a. asteroid.
a. Saturn and Jupiter b. meteorite.
b. Mercury and Pluto c. comet.
c. Neptune and Uranus d. None of the above is correct.
d. Earth and Mars 29. A small body from space that falls on the surface of Earth is a
19. Area of the solar system where long-period comets originate is the a. meteoroid.
a. asteroid belt. b. meteor.
b. Oort cloud. c. meteor shower.
c. Kuiper Belt. d. meteorite.
d. region between Jupiter and Neptune.

15-25 CHAPTER 15 The Solar System 401