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.
In the pitch black and cold, they survive by feasting on dead and decaying fish and other marine animals. Recreational walks in the wilderness are becoming increasingly popular. In this way people gain first-hand experience of nature and develop positive attitudes towards conservation. Those going on such walks should at least know about the possible dangers involved, so that they will know what to do and not give way to irrational fears.