Mercury has a large metallic core with a relatively thin rocky crust and mantle that has a high abundance of sulfur and potassium. Its magnetic field is off-center, which indicates that its internal structure is complex ... More »

Air is a gaseous substance that is composed primarily of nitrogen, oxygen and argon. The air in the atmosphere that surrounds the Earth is approximately 78 percent nitrogen, 21 percent oxygen and 1 percent argon, with th... More »

Asteroids and comets differ in composition due to where they were formed. Most asteroids are the rocky remnants of failed planets created in the inner solar system, while comets formed further out where frozen gases and ... More » Science Astronomy Comets & Asteroids

Although the chemical composition of wood varies from species to species, wood is primarily composed of carbon, hydrogen, oxygen, calcium, potassium, sulfur, nitrogen and magnesium. Most wood contains some amount of wate... More »

Mercury, the element, has a density of approximately 13.5 to 13.6 kg/m^3, and its overall mass depends on the volume collected. The planet Mercury has a mass of approximately 3.3 * 10^23 kilograms, or .055 times the mass... More »

Mercury acetate is a chemical compound with a solid crystalline structure that is white or yellow in color. This substance has a mild vinegar odor that is toxic when it is inhaled. Since mercury acetate is hazardous, it ... More » Science Chemistry

The four layers of the Earth are called the inner core, the outer core, the mantle and the crust. In addition, there are two different types of crust. The continental crust is the part that is under land, and the oceanic... More »