Revolution The revolution of Mercury is 88 earth days
Composistion Mercury is a terrestrial planet (rocky). Mercury also has a solid, catered, surface like earth. Mercury’s thin atmosphere is composed of mostly oxygen, sodium, hydrogen, helium and potassium. The surface by the solar wind and meteoroid impacts create Mercury atmosphere.
Unique Characteristics Mercury has no liquid water and almost no atmosphere. Mercury's mass is small, so it's gravity is weak. The interior of Mercury is made up of mainly dense metal iron.