Crossword puzzle clue "geology subject"

Here are the possible solutions for geology subject clue

Answer
Clue
Relevancy
erosion
Clue
Geology subject
Definition
the act of eroding
aeon
Clue
Unit in a geology book
Time span in a geology book
Division of geology
Definition
the largest division of geological time, composed of several eras, also EON
earthscience
Clue
Geology, e.g.
Geology, for one
earthsciences
Clue
Geology and meteorology
eon
Clue
One billion years, in geology
Definition
a long period of time, also AEON

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