The Interior of Mercury Contains

question 179

Multiple Choice

The interior of Mercury contains

• A) significant amounts of water as permafrost because occasional melting has produced deep water-formed valleys that crisscross the planet's surface.
• B) mostly ices and very low-density material because the planet's average density is close to that of water.
• C) an iron core that occupies a large fraction of the volume of the overall planet and produces a magnetic field.
• D) very little iron, in contrast to Earth, and so the planet has no magnetic field.