Mid-sized black holes of a few thousand solar masses have been found in the cores of some

Mid-sized black holes of a few thousand solar masses have been found in the cores of some
 
  a. open clusters.
  b. emission nebulae.
  c. elliptical galaxies.
  d. globular clusters.
  e. dark molecular clouds.

Question 2

Volcanism can occur in a midocean rift, above a hot spot in the mantle, or where one tectonic plate slides below another.
 
  Indicate whether the statement is true or false

Question 3

The discovery of the gravitational lens effect for quasars
 
  a. shows that quasars were located within the local group of galaxies.
  b. shows that quasars were giant planets in our solar system.
  c. shows that quasars are much further away than the distant galaxy that forms the gravitational lens.
  d. proves Newton's theory of gravitation by showing that the photon was affected by gravity.
  e. proves the existence of super massive black holes at the center of active galactic nuclei.