The mantle extends from the core to about 500 km beneath the surface. The crust of a planet is formed from its mantle, and the volume of the crust represents the amount of mantle that has been converted. In general, the measurements show that Mercury's surface composition is very different from that of other planets in the solar system. Composition of Mercury Mercury is a terrestrial planet, like like all of the 4 inner planets: Mercury, Venus, Earth and Mars. Its low surface gravity makes holding on to an atmosphere in the best of … Mercury - Mercury - Surface composition: Messenger used X-ray fluorescence spectra to study the surface composition of Mercury. It found a high ratio of magnesium to silicon and low ratios of aluminum and calcium to silicon, which showed that the crust was not rich in feldspar like that of the Moon. Temperatures on the surface of Mercury are extreme, both hot and cold. It is dominated by … The composition of Mercury is probably high in iron, although surface features indicate that volcanic activity once existed at the surface. Scientists believe that the interior structure of Mercury includes a metallic core, an intermediate rocky layer, and a thin brittle crust.
Because the planet has no atmosphere to retain that heat, nighttime temperatures on the surface can drop to minus 290 degrees Fahrenheit (minus 180 degrees Celsius). Atmospheric components Mercury is the smallest and least massive of the eight planets. The crust of Mercury is thin, but quite dense.
Mercury's iron core generates a magnetic field about one percent as strong as Earth's.
During the day, temperatures on Mercury's surface can reach 800 degrees Fahrenheit (430 degrees Celsius). There is little evidence of motions near the surface of the planet now, although at earlier times during Mercury's evolution the surface was … It is mostly composed of silicates and other metals, including iron.