GWD-29-2

1. core
   rotates independently of and more quickly than Earth’s outer layers is
   responsible for advancing studies of the flow of heat from the inner
   through the outer planet and of the formation and periodic reversal in
   direction of Earth’s magnetic field
2. core
   rotates independently of and more quickly than Earth’s outer layers is
   responsible for advancing studies of how heat from the inner core flows
   through the outer planet, and the formation and periodic reversal in
   direction of Earth’s magnetic field
3. core
   rotates independently and more quickly than Earth’s outer layers are
   responsible for advancing studies of how heat from the inner core flows
   through the outer planet, and how Earth’s magnetic field forms and the
   periodic reversal of its direction
4. core,
   rotating independently and more quickly than Earth’s outer layers, are
   responsible for advancing studies of the flow of heat from the inner
   through the outer planet, and the formation and periodic reversal in
   direction of Earth’s magnetic field
5. core,
   rotating independently of and more quickly than Earth’s outer layers,
   is responsible for advancing studies of the flow of heat from the inner
   through the outer planet and of how Earth’s magnetic field forms and
   the periodic reversal of its direction
   

B的of不应该省略（介词通常不省略，否则容易引起歧义）

A为：core rotates independently of and more quickly than Earth’s outer layers is responsible for advancing studies of the flow of heat from the inner through the outer planet and （studies） of the formation and periodic reversal in direction of Earth’s magnetic field

B不好：不对称是一方面，and前面也不应该有那个逗号

不知道大家有没有注意到:

A为：core rotates independently of and more quickly than Earth’s outer layers is responsible for advancing studies of the flow of heat from the inner through the outer planet and （studies） of the formation and periodic reversal in direction of Earth’s magnetic field

这里independently of , 这个OF是不是多余的啊?