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.
Best Answer: Rough rule of thumb: 120 calories per trail mile hiked plus 120 calories per 1,000 feet altitude gain. You can burn surprisingly few calories in hiking up most easy mountains. Hiking up a 10 mile trail with 6,000' gain will only burn about 1,920 calories.On the other hand, if you climbed the mountain in the hard way, off-trail and with a full pack, you can burn twice as much.Source(s):Scythian1950 Â· 6 years ago.est Answer: Rough rule of thumb: 120 calories per trail mile hiked plus 120 calories per 1,000 feet altitude gain. You can burn surprisingly few calories in hiking up most easy mountains. Hiking up a 10 mile trail with 6,000' gain will only burn about 1,920 calories.