The extraction process to remove the lead from the sulfur is very simple, thus lead has been extracted from Galena since the earliest times.Galena from certain regions is rich in silver, and some specimens may contain as much as 20 percent silver. Because of this, silver-rich Galena is also an ore of silver.
Being exposed to sunshine will also increase your levels of vitamin D. Hiking is a cardiovascular activity, depending on how hard you push yourself during a hike, and thus has benefits for your cardiovascular system, such as reducing the chances of heart disease, and increasing your overall fitness.
The hazards of hiking the Appalachian Trail is there are bears, snakes and wild boars, but if precautions are taken it should not prove as a very dangerous hazard. Benefits of hiking the Appalachian trail is the self-satisfaction of knowing you did it! only 20% of thru-hikers complete the journey.