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| Description: Hints of Earth’s Early Appearance (b) Such scars are rare on today’s Earth. Most extraterrestrial objects burn up from friction as they pass through the atmosphere, and the craters formed by those that do reach the surface are soon erased by natural processes such as erosion. This crater, 1.2 kilometers (0.75 mi) across, formed in the Arizona desert when an asteroid 20 meters (65 ft) in diameter struck Earth. The impact occurred a mere 50,000 years ago—recently enough for the evidence to still be visible. Picture Stats: Views: 609 Filesize: 156.54kB Height: 1080 Width: 1321 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18962 |