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.
Research shows that hiking has a positive impact on combating the symptoms of stress and anxiety, says Gregory A. Miller, PhD, president of the American Hiking Society. Being in nature is ingrained in our DNA, and we sometimes forget that.
The best exercise to prepare for a hike is good, old fashioned walking. Walking provides both a cardiovascular workout and strengthens the same muscles you'll use on your hike. Begin by walking 30 to 45 minutes three days a week to train for a five mile (eight kilometer) hike. On a fourth day, take a longer walk and increase your distance each week until you're walking about two-thirds of the length of your hike [source: Spilner and Robertson ].