hadean
/ˈheɪdiən/
adjective
- Relating to the earliest geological eon of Earth's history, from about 4.6 to 4 billion years ago, before the first rocks formed.
- The Hadean eon was a time of intense volcanic activity and asteroid impacts.
- Scientists study zircon crystals to learn about the Hadean period.
- No rocks from the Hadean eon survive on Earth's surface today.
- Relating to or resembling the underworld or hell; infernal.
- The landscape after the eruption looked almost Hadean in its desolation.
- The deep cavern had a Hadean atmosphere, hot and sulfurous.
- The novel described a Hadean realm of fire and darkness.