The Compositions of the Planets

Multiple Choice

The compositions of the planets

A) Are all very similar, so other planets may be able to support life or provide needed resources.
B) Are entirely unknown; geologists cannot judge their similarity to earth.
C) Were originally the same but have been changed by radiation from the sun over the life of the solar system.
D) Were controlled by the distance from the sun at which each formed, except for the largest planets.