Nasa’s Earth Observatory has tracked down images resembling all 26 letters of the English alphabet using satellite imagery and astronaut photography. Vowel A: Utah’s Green river doubling back on itself, a feature known as Bowknot Bend.
Vowel E: phytoplankton bloom off the New Zealand coast
Vowel I: Andaman islands. The thin, bright rings surrounding several of the islands are coral reefs that were lifted by an earthquake near Sumatra in 2004.
Vowel O: Tenoumer meteorite crater in Mauritania. The meteorite struck Earth between 10,000 and 30,000 years ago.
Vowel U: Gooseneck state park, Utah.