Most objects that fall to earth from space are stony, but a small proportion, such as the one pictured, are ‘iron meteorites’ with iron contents of over 90 percent.Iron corrodes easily, so iron artifacts from ancient times are much rarer that objects made of silver or gold. Potassium is a chemical element with symbol K (derived from Neo-Latin, kalium) and atomic number 19.It was first isolated from potash, the ashes of plants, from which its name derives.Photo by Carl Allen, NASA JSC Photo S94-43472 Scrap iron and steel for recycling.How times have changed; iron was once worth eight times more than gold. The first iron used by humans is likely to have come from meteorites.Red blood cells - the color comes from iron in hemoglobin. If you grew x 10,000, you could place your feet in Seattle and touch Perth, Australia with your hands.Iron in hemoglobin carries oxygen around our bodies. Close up of an iron meteorite: Meteorites such as this one were probably our ancestors’ first source of iron.
Whenever the worldview of evolution is questioned, this topic always comes up.
and the ages of fossil hominids, molecular dating and divergence times for mammalian lineages, meteorites and the age of the solar system, and the use of color-magnitude diagrams for assessing ages of collections of stars.
method is based upon the decay of radioactive potassium-40 to radioactive argon-40 in minerals and rocks; potassium-40 also decays to calcium-40.
Gunpowder is classified as a low explosive because of its relatively slow decomposition rate and consequently low brisance.
Low explosives deflagrate (i.e., burn) at subsonic speeds, whereas high explosives detonate, producing a supersonic wave.