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Hints of Earth’s Early Appearance

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.
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