An alternative to the core-accretion theory that explains the formation of the jovian planets is the:
A) differentiation theory.
B) collision theory.
C) gravitational instability theory.
D) Big Bang theory.
E) nebular contraction theory.
Question 2
Which internal heat source still generates heat within the terrestrial worlds today?
A) heat of accretion
B) heat from differentiation
C) heat from convection
D) heat from radioactive decay