approximately 17,000 meteors

Even though approximately 17,000 meteors weighing more than 50 grams hit Earth each year, most are made of stone. Only about 4 percent are composed of iron alloys with abnormal nickel content that people can use. These materials became a rare commodity for ancient people, who began valuing this easy-made iron above gold. Cuneiform tablets found at the Old Assyrian Colonial site of Kültepe-Kanesh in Turkey from approximately 4,000 years ago refer to a “sky metal” that cost as much as 40 times the price of silver. Silver was the most valuable common precious metal in the region at the time. สล็อต