The first small solid grains or flakes formed in our solar system by the process of ____________, ...

The first small solid grains or flakes formed in our solar system by the process of ____________, the addition of material to an object an atom or molecule at a time.
 
  a. accretion
  b. sublimation
  c. hydration
  d. condensation
  e. vaporization

Question 2

____________ are located beyond the asteroid belt (3 AU) from the Sun, have extremely large masses and very low densities.
 
  a. Comets
  b. Extrasolar planets
  c. Asteroids
  d. Terrestrial planets
  e. Jovian planets

Question 3

An extrasolar planet is
 
  a. a planet that orbits our Sun that we have not yet discovered.
  b. one not needed for the formation of our solar system which is kept in a special area just in case.
  c. a planet found orbiting around a star other than the Sun.
  d. another name for an asteroid.
  e. a planet extra close to our Sun.