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.
There are plenty of ways to enjoy a warm spring afternoon, but riding a bike is one of the most active ways to spend your leisure time. According to NutriStrategy, a relaxing bike ride (<10 mph) burns more calories than an easy walk (2 mph)â281 calories versus 176 calories per hour. Challenge yourself by powering your way up hills and pushing your speed over 10 mph, but even keeping to a leisurely pace is a great way to supplement an active lifestyle.