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.
Based on the the list of hiking activities, shown below, the average calories burned for an average male, weighing 190 pounds (86 kg) is 646 Calories for one hour of hiking. The average burnt for an average female, weighing 163 pounds (74 kg) is 555 Calories for one hour of hiking.