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.
Outdoor hiking has a myriad of benefits for both the body and the mind. Hiking is inexpensive and easy to start, so you can participate no matter how fit you currently are. Most people live within driving distance of wonderful hiking spots and discovering these places is a good way of getting to know an area. Here's a look at some of the benefits of hiking. Outdoor Hiking Promotes Mental Health. Hiking is much more varied than many other types of exercise, particularly those undertaken in a gym.
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 ].