7. Dinosaurs were still roaming the Earth when an asteroid fragment created the Ouarkziz crater in Algeria 70 million years ago.
4. Mauritania’s Tenoumer Crater crafted an almost perfect circle in ancient rock during an impact 10,000 and 30,000 years ago.
2. Captured here in false color is Gosses Bluff crater in Australia, which came into existence 140 million years ago.