What inevitably forces a star like the Sun to evolve away from ...

[D2AR0N]

What inevitably forces a star like the Sun to evolve away from being a main sequence star?
 
  A) The core begins fusing iron.
  B) The star uses up all its supply of hydrogen.
  C) The carbon detonation explodes it as a type I supernova.
  D) Helium builds up in the core, while the hydrogen burning shell expands.
  E) The core loses all its neutrinos, so all fusion ceases.

Question 2

Spreading centers are marked by mid-ocean ridges where hot mantle material rises upward and then spreads sideways.
 
  Indicate whether the statement is true or false

[mjbamaung]

Answer to Question 1

D

Answer to Question 2

TRUE

[D2AR0N]

Excellent

[abro1885]

Thanks for the timely response, appreciate it