A medical license is an occupational license that permits a person to legally practice medicine. Most nations require such a license, bestowed either by a specified government-approved professional association or a government agency. Licenses are not granted automatically to all people with medical degrees. A medical school graduate must receive a license to practice medicine to legally be called a physician. The process typically requires testing by a medical board. The medical license is the d
Strip mining is the practice of mining a seam of mineral, by first removing a long strip of overlying soil and rock (the overburden). It is most commonly used to mine coal and lignite (brown coal) . Strip mining is only practical when the ore body to be excavated is relatively near the surface.This type of mining uses some of the largest machines on earth, including bucket-wheel excavators which can move as much as 12,000 cubic meters of earth per hour.trip mining is only practical when the ore body to be excavated is relatively near the surface. This type of mining uses some of the largest machines on earth, including bucket-wheel excavators which can move as much as 12,000 cubic meters of earth per hour.
Finding and exploiting mineral deposits requires the application of the principles of geology that you have learned throughout this course. Some minerals are used as they are found in the ground, i.e. they require no further processing or very little processing. For example-gemstones, sand, gravel, and salt (halite) .Most minerals must be processed before they are used. For example: 1  Iron is the found in abundance in minerals, but the process of extracting iron from different minerals varies in cost depending on the mineral.2  Aluminum is the third most abundant mineral in the Earth's crust. Aluminum is the third most abundant mineral in the Earth's crust. 2  It occurs in the most common minerals of the crust-the feldspars (NaAlSi3O8, KalSi3O8, & CaAl2Si2O8, but the cost of extracting the Aluminum from these minerals is high.