9. What is a small body of matter from outer space that enters the earth's
atmosphere as a streak of light?
A. asteroid
B. meteor
C. meteoroid
D. meteorite
10. What do asteroids and comets have in common?
A. They have similar densities.
B. They have similar orbital radii.
C. They have similar range of orbital inclinations,
D. Most are unchanged since their formation is in the solar nebula.
11. What do you call a rocky leftover planetesimal orbiting the sun?
A. asteroid
B. comet
C. meteor
D. meteorite
12. Why do asteroids and comets differ in composition?
A. Asteroids are much larger than comets.
B. Asteroids and comets formed at different times.
C. Comets formed from the Jovian nebula, while asteroids did not
D. Asteroids made of rocky material while comet from ice and dust.
13. What characteristic distinguishes a meteorite from a terrestrial rock? A
meteorite
A. usually has a high metal content
B. contain rare elements such as iridium that terrestrial rocks do not
C. usually covered with a dark crust from burning in earth's atmosphere
D. All of the above
14. Which describes a meteorite?
A. rocky and primitive
B. rocky and processed
C. carbon-rich and primitive
D. carbon-rich and processed
15. What part of a comet points most directly away from the sun?
A coma
C. nucleus
B. jets of gas
D. plasma tail​