When the earth was large enough, it is believed to
have separated into layers with the densest layer in
the center (the core), the next dense layer in the
middle (the mantle), and the least dense layer at
the surface (the crust). What force caused earth's
elements and compounds to separate into layers?
A gravity
B impacts from planetesimals
c heat from the decay of
radioactive elements
D all of the above
The Palenie