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This Concept Map, created with IHMC CmapTools, has information related to: Mercury and the Moon, atmosphere - both have essentially no atmos So they have very variable temperatures, Have no plate tectonics, a single plate Therfore The surface is old - not much movement, How are Mercury and the Moon similar? How are they different and why? Composition surface, are very cratered Why? atmosphere - both have essentially no atmos, Mercury:thick rocky mantle and very very large iron-rich core , Moon: earth like, crust, mantle, layers, small iron-rich core Iron Core Magnetic fields: mecury has a weak magnetic field, but stronger than the moon's, The Sun i.e. Moon:1AU, Mercury: 0.387 AU, surface Both Have no plate tectonics, a single plate, Moon:1AU, Mercury: 0.387 AU Thus Mercury has much higher temp, How are Mercury and the Moon similar? How are they different and why? Orbit The Moon orbits Eath, Mercury orbits the Sun, Rotation Tilt Moon = 1.54 degrees, Mercury = virtually nil, Interior Consists of Mercury:thick rocky mantle and very very large iron-rich core , Moon: earth like, crust, mantle, layers, small iron-rich core, surface Both are very cratered, Rotation ???? Mercury: not syncronus: three rotations in axis for every two sun-orbits, Moon: Synchronous: 1 axis rotation in 1 earth-orbit, The surface is old - not much movement and so are very cratered, How are Mercury and the Moon similar? How are they different and why? Composition Interior, How are Mercury and the Moon similar? How are they different and why? Av. Distance from The Sun, they have very variable temperatures i.e. Mercury:350°C to -170°C. Moon:130°C to-180°C, The Moon orbits Eath, Mercury orbits the Sun ???? Rotation, Moon (3476km diameter) is much smaller than Mercury (4880km) Thus gravity; Mercury:0.38, Moon:0.17, Mercury has much higher temp i.e. Mercury:350°C to -170°C. Moon:130°C to-180°C