Go to the website provided by your instructor and fill in the blanks. Mercury Mercury, the innermost planet of the solar system, is a little bigger than the Earth's Moon. The surface of the planet is covered with craters, like the Moon, but temperatures there can reach over .F because Mercury is so close to the Sun and rotates so slowly. Scientists believe that the interior of Mercury includes a metallic core, an intermediate rocky layer, and a thin brittle crust. The composition of Mercury is probably high in although surface features indicate that volcanic activity once existed at the surface. There is little evidence of motions near the surface of the planet now, although at earlier times during Mercury's evolution the surface was much more active. Mercury has a magnetic field. Its field is weak. Earth's magnetic field is tilted, and so is Mercury's. That means Mercury's magnetic poles are not in the same place as its Mercury has a global magnetic field like Earth's. Earth's magnetic field is about times stronger than Mercury's field. Scientists think swirling motions in the planet's molten iron core create Mercury's magnetic field. Mercury has