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.
Time to hike: Living on a higher altitude could help prevent overweight people from becoming obese, a U.S. study has found. The group of American researchers looked at nearly 100,000 U.S. Army or Air force servicemen and women, with at least two years of service, from January 2006 to December.