The reason that Earth is now closest to the Sun in January, but ...

[jazziefee]

The reason that Earth is now closest to the Sun in January, but will be closest in July in 11,000 years,
  is:
  a. orbital eccentricity.
  b. changes in axial tilt.
  c. precession of the equinoxes.
  d. gravitational attraction to the sun.
  e. gravitational attraction to the moon.

Question 2

The ice ages are caused by:
  a. the drift of the continents.
  b. the eruption of supervolcanoes.
  c. the sunspot cycle.
  d. minor changes in Earth's rotation and orbit.
  e. variations in solar output.

[succesfull]

Answer to Question 1

C

Answer to Question 2

D

[jazziefee]

Excellent

[marict]

Thanks for the timely response, appreciate it