Now we are looking on the crossword clue for: Valuable stuff found underground.
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Possible Answers:
Ore .
Last seen on: Daily Celebrity Crossword – 9/18/20 Sports Fan Friday
Random information on the term ” Ore “:
Artist’s impression of the Archean Eon.
The Archean Eon ( /ɑːrˈkiːən/ ar-KEE-ən, also spelled Archaean or Archæan) is one of the four geologic eons of Earth’s history, occurring 4,000 to 2,500 million years ago (4 to 2.5 Gya). During the Archean, the Earth’s crust had cooled enough to allow the formation of continents and the beginning of life on Earth.
The word ‘Archean’ comes from the ancient Greek word Αρχή (Arkhē), meaning ‘beginning, origin.’ It was first used in 1872, when it meant “of the earliest geological age.”[a] Before the Hadean Eon was recognized, the Archean spanned Earth’s early history from its formation about 4,540 million years ago (Mya) until 2,500 Mya.[citation needed]
Instead of being based on stratigraphy, the beginning and end of the Archean Eon are defined chronometrically. The eon’s lower boundary or starting point of 4 Gya (4 billion years ago) is officially recognized by the International Commission on Stratigraphy.