Crossword puzzle clue "the hadean was the first one ending about 4 billion years ago"

Here are the possible solutions for the hadean was the first one ending about 4 billion years ago clue

Answer
Clue
Relevancy
eon
Clue
The Hadean was the first one, ending about 4 billion years ago
The Hadean was the earth's first one
Hadean or Archean, e.g.
Years and years and years
Definition
a long period of time, also AEON
anni
Clue
Years, many years ago
Years many years ago
ages
Clue
Years and years and years
Definition
AGE, to grow old
eons
Clue
Years and years and years
Definition
EON, a long period of time, also AEON

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