The Milky Way is part of I. a poor cluster. II. a rich cluster. III. the Virgo Cluster. IV. the ...

The Milky Way is part of I. a poor cluster. II. a rich cluster. III. the Virgo Cluster. IV. the Local Group.
 
  a. I and III
  b. I and IV
  c. II and III
  d. II and IV
  e. just III

Question 2

That Mercury has a large iron core is evidenced by
 
  a. the large lobate scarps.
  b. the large mean density of Mercury.
  c. the lava flows near Caloris Basin.
  d. all of the above
  e. none of the above

Question 3

A ____ generally contains well over 1000 galaxies and is quite dense. They often contain many giant elliptical galaxies.
 
  a. local group
  b. poor cluster
  c. rich cluster
  d. tidal tail
  e. quasar

Question 4

The theory that Mercury shrank slightly when it was young has been proposed to explain
 
  a. extended lava plains.
  b. large craters.
  c. magnetic field.
  d. lobate scarps.
  e. regolith.